Malicious PDF — malware analysis report

Static analysis result for SHA-256 844a9c2f58980f7a…

MALICIOUS

PDF

69.4 KB Created: 2021-03-31 18:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7317c2ea69ee23406c26407e646a21ff SHA-1: b4de55ce3962db78d72f4dae7b5cf269ccda1d20 SHA-256: 844a9c2f58980f7a564e088af19e9dcfe86c216b7b1e64790e4e555bbc951204
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. The 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics indicate a strong intent to direct users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this document, likely used as a phishing lure or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/award?keyword=nccn+breast+cancer+pdf In PDF document text
    • https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/dexavulikerex.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/99e9864a1.pdfIn PDF document text
    • http://artrosil.xyz/fl_studio_mobile_free_trial_downloadvq5bg.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/ccna_routing_and_switching_icnd1.pdfIn PDF document text
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/witexazezabeweru.pdfIn PDF document text
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/2073939074d5.pdfIn PDF document text
    • http://sberhome.ru/nipopamixenifeperibenon9ljwk.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/25475102912.pdfIn PDF document text
    • http://mosquito.codes/adms-2i_ft-8800_programming_softwaregk9w2.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/pringles_ring_stem_challenge.pdfIn PDF document text
    • http://odemebayisitrafik.com/marathi_movies_sites_2018_freeucbdz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_20a15a09d6fe489ab2e730c7d807bde2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/bapudixemexulupekejikox.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_163fcb8a9609444ebac79ece8c8cab74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/82095486385.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/70741593413.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/31173976821.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/58479485162.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_4024b06d23ba4de4ab5f78e0211470ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/loreal_hair_mask_sheet.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_90bd8543ec51477b9038c9b5d13806c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuponefi/flight_crash_videos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/co_founder_agreement_template_uk.pdfIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 5228 bytes
SHA-256: 84ffff36dde785d58a69a724b95c84d3c17b738c9eef80884cb090bbd34ed66d
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10244 bytes
SHA-256: f202ef4b845f7b3b659dcf695c2e8b17484b0204064416df66ee0b32b00789c2

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