Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e400ea073211f4…

MALICIOUS

PDF

109.1 KB Created: 2021-03-08 23:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba8b6d5ca0278c2677eff7b914492aac SHA-1: 1aca8f82789fb112541b839e21336b0494be6f57 SHA-256: d5e400ea073211f4da32b577fb08f4f49cc0dce5c8618d085d140f58889825cd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One primary URL, https://mezovuduw.ru/award?keyword=ethnographic+approach+to+research+pdf, is flagged as unknown reputation, and the document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond link distribution. No scripts were extracted, but the PDF structure itself facilitates the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/award?keyword=ethnographic+approach+to+research+pdf PDF link annotation
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/xoxodema.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/suvenaxutusakevu.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/d751628aaec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_9158a3467e2b40e097a5e4a14897a99a.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_c7887ca75c3e41f9bdc33c5e21235b05.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_aa31191ade084adbb567fa7ce063abfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da71b260-4488-43ba-91fa-1af85606ad70/big_little_lies_soundtrack_name.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/74752938835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212ce2f1-2529-4deb-bb1e-36d642197549/vutetujodalamamajijile.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/classification_of_anemia.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_e9399626faf9419bad8c191804502cbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ce8223-6fbb-41c9-903d-cd73c1c1677c/6447843387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6791ae-4ccd-4781-b012-adb631814dc6/33357112726.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_f77c8c8bc1ae4b8bbfb3ec9e197a88a1.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b965f53ae0c84f66a74f910436f59f54.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_c4849381fcdb4ac2946517183ba1d62e.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_5673856ec5bc41959d194509794231de.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_a3d7b330b0ec462cadf27f954e6d6b7c.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_acbd35c582ee4dc18bdfc6b1b637da1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d5a1c6-e5df-4733-a6c7-d883696dc855/2500183476.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/calendar_meeting_scheduler_template.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_d73c331607b14e60879335c9d85c9e23.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_2761a0963e16449c9b571ac89f522849.pdf?index=trueIn 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_off00016b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B53 5340 bytes
SHA-256: 307a30b859e4b6a7e86043e392ef1d358320c676f9bc877aee94fa9fc59c0c38
font_01_sfnt_off00017d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7E 12768 bytes
SHA-256: fa3feb9a9a6c8ac9779746ab81294df03fb4c9fe101da11aa8384b9b4bc7cfb8

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