Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b731f94b561211d…

MALICIOUS

PDF

95.5 KB Created: 2021-02-22 02:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 22c0618ab392c21d9dbdddfce9de8fb5 SHA-1: d461d9fcf058005ba81ad0b8820148514b02dfee SHA-256: 5b731f94b561211d5098d6bebe1be3e64376c9cb10a4fb27b0986db7e96d2cb1
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as redirectors or part of a link farm designed to obscure malicious destinations. The document body, though truncated, suggests a lure related to movie streaming, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/123?utm_term=le+petit+nicola+film+complet+streaming In PDF document text
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/vipesafudevata.pdfIn PDF document text
    • http://zadokutasige.22web.org/vamujisufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fe42e41c2a72.pdfIn PDF document text
    • http://fasusugexewi.22web.org/74410255717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_60282d2c00e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600ad7b73e331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legofovivaxom.epizy.com/hotel_breakfast_menu_template.pdfIn PDF document text
    • http://xewenofos.epizy.com/chinese_picture_dictionary_free.pdfIn PDF document text
    • http://bidusopevix.epizy.com/the_water_fountain_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/jobuko.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/6945314799.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/tiximulim.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/new_housing_scheme_in_lahore_2019_form.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/affidavit_of_loss_sample_form_philippines.pdfIn PDF document text
    • http://rigirulame.epizy.com/7348014186.pdfIn PDF document text
    • http://zasujofimak.epizy.com/businessman_telugu_movie_video_songs_hd.pdfIn PDF document text
    • http://fujuresaw.epizy.com/88284116921.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 PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 5276 bytes
SHA-256: 4bbee5ca79c47029f162c3227a69b5806b8ae7e9267b92f33260c8d66cfbc935
font_01_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 3140 bytes
SHA-256: c024d3fc6cb2753b9f8c882f63a9330b16a58b405cf972fe809751d1b30ee444
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 10736 bytes
SHA-256: d86de86c1ec864d21c106097d32d796d8c2a3e7e02f3b12481cae662add5fdac
font_03_sfnt_off00015b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B12 16116 bytes
SHA-256: c09cc2ccf8fc0e315d8ea4f55aef24379b100bddff11a5a088032004528be4e6