Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4b041d80cdaf29…

MALICIOUS

PDF

66.9 KB Created: 2020-12-20 10:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9192bdd75cd9b682019eb1d22f2878a9 SHA-1: 4178004dfa1cde66e1e8e5854fb5ee8715d27346 SHA-256: 9c4b041d80cdaf29cd1cab6ba4ea5a844ebd30a20e899e4e0c44c441588f457b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=consecuencias+del+pecado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5fb5a8656f0fe.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/4246393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5fc3ba5be8627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5fa22f84d9852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fbee3f7955e1.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/vosiderabelomagera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fcf132e5e68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fd647a48a80e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5389b8139af0376616de8/t/5fcea9e7e4d8f2662cf8b508/1607379431605/twinkle_unicorn_cat_princess_app_store.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdefad173fb5383b670fb2/1606283184011/92938678813.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1ac7a40f1034a5cae5b81/t/5fc81c9c970db930d9b3aaad/1606950045963/86052406270.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe31aa9ee0f32b871e3b3a/1606300075697/amoeba_sisters_characteristics_of_life_quizlet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 4876 bytes
SHA-256: 61285a1e437ec441d47722b4e06f32183a56c12a75922548f1dd6398f42bf3fc
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10896 bytes
SHA-256: b5ebf922675bb6ce880f2b6c1a8d0e01de6f4b2e275c6a210cabcaba975128f9

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