Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4be45510a79682b…

MALICIOUS

PDF

83.5 KB Created: 2021-03-24 18:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 25f1cd683d34f7ac0ef13a82443bc7cb SHA-1: 22d4969991fbff484e602f55cbd7737655129d0c SHA-256: f4be45510a79682bb3e8d0682f3d6d0ecb37d1a66de68c901c4e1e3172028180
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. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including suspicious ones like 'https://nipisod.ru/123?utm_term=wwe+raw+raw+results+bleacher+report'. This behavior is consistent with phishing or SEO manipulation tactics, likely intended to drive traffic to malicious sites or gather user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=wwe+raw+raw+results+bleacher+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365662/normal_604ac936cb2d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_603fc4bbe9d5f.pdfIn PDF document text
    • https://lakadepoti.weebly.com/uploads/1/3/5/3/135301691/3987559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_6011dddf31626.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/wipasamawarifovukoda.pdfIn PDF document text
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/maxagozavekefig-navezenokujeg-padaniruzetob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474478/normal_5fc8c4ba7799f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6056ddeb329cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_b821ae30ed354112b61f4ab566f83193.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/fetal_circulation_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/fozefotif.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_cde09400a6fc4b0eaf963d9740af88ee.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_6c614ea300ba4389969b4b3b7b4d79d6.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_83f6c889aeed4472ba98ec9795d47af4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/canadian_drone_test_study_guide.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_73cc95160ea142d9aa4b6ef41e220d6f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 4996 bytes
SHA-256: a6bdae2dfafd8ecb255e5943e4d83db559127f719ec2e59111bb62dd26d21b5c
font_01_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10588 bytes
SHA-256: 8526eafde65d43b96f5558b99c49968fe0f6aa4b6cdd1b7914731a4cb7d87265
font_02_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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