Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4bea66d4870a5c…

MALICIOUS

PDF

400.6 KB Created: 2021-02-25 00:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17c0857b62fbcf58157e5108b99316c9 SHA-1: 51d60a8812fc3f6ab2731fdc648fabfdee8c21d4 SHA-256: 3f4bea66d4870a5c07cf33a4a9939af117566e46f99c8447cb7352e17f87a801
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'yafferge.ru'. The document body also contains numerous URLs and text related to book downloads, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports this attack pattern. While no scripts were extracted, the malicious redirector and the nature of the embedded URLs strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7906

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=machine+learning+with+raspberry+pi+book In PDF document text
    • https://cdn.sqhk.co/zerurukoraju/8RIIUPA/40248747534.pdfIn PDF document text
    • http://bighome.space/python_language_informationir6uj.pdfIn PDF document text
    • http://front-glass.space/anglo_saxon_literature_characteristicsdeogw.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hffrif7/path_of_warriors_cave_entrance.pdfIn PDF document text
    • http://reduslimitaly-official.site/berserk_of_gluttony_light_novel_downloadwy6kj.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/computer_coding_languages.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/mechanical_engineering_internships_washington_state.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fcd5735eda0c.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/jekekudezewatozoduwu.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/jhbmjeg/febizev.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/denewa.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gejj5TY/sajajufuwikexafa.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/rajeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600a23014388c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fe9e7c473210.pdfIn PDF document text
    • http://pornbustyvids.com/guboxuwg7wmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60107154baba0.pdfIn PDF document text
    • http://leledup.mypressonline.com/weight_loss_chart_printable.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In extracted file (font_00_sfnt_off0005bd4f.bin)
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off0005c523.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off0005c523.bin)
    • http://www.daltonmaag.com/In extracted file (font_04_sfnt_off000622f5.bin)
    • http://rowopiva.rf.gd/61074260319.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/60966296825.pdfIn PDF document text
    • http://bibikefogive.epizy.com/23402880720.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/vutop.pdfIn PDF document text
    • http://segisubab.epizy.com/46086589317.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_01_sfnt_off0005c523.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off00060d2b.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off00060d2b.bin)

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005bd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD4F 1568 bytes
SHA-256: 0172e917773b239235d24d9c0462b0dc2e040d9419e5f948fb092b7f031ee502
font_01_sfnt_off0005c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C523 5388 bytes
SHA-256: d49242b2495b36c289f1eec99f606d504ceffc3dcd1266b8af82ca3af7343dfb
font_02_sfnt_off0005d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D773 17008 bytes
SHA-256: e8a2ec3217f8d03cfeb09b07e36e8d20fa8f3e2e5c0d0068fd0d53693cd05037
font_03_sfnt_off00060d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D2B 16324 bytes
SHA-256: aaa5a70fd042af775cba0fcb3a6e8bf3302800bdd7391023eb2d6a684dcf43e9
font_04_sfnt_off000622f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622F5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f