Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a728ac4b36e86c6…

MALICIOUS

PDF

94.6 KB Created: 2021-03-23 05:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 162bf3f1ba30cfe2dfdca61c21f1433e SHA-1: c3d0437937c66aef736f4a11b779e5b9a5f38520 SHA-256: 1a728ac4b36e86c6d95b710dc582e065c285d1566bb8abd70762e247152bcf0a
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. The document contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially malicious sites. The primary suspicious URL identified is https://gimoguvi.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=lenguaje+corporal+de+los+perros+pomerania PDF link annotation
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/9616277.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/9664968800.pdfIn PDF document text
    • http://dirtygirl.fun/ikatex_s.a_de_c.v89kbe.pdfIn PDF document text
    • http://claire-irk.ru/44711001506p4jkz.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/23543551687.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/16897435847fihis.pdfIn PDF document text
    • http://dektesheff.xyz/similar_triangles_missing_sides_worksheet_answer_keyh0wa2.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/89da78.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/dibitunolekeb.pdfIn PDF document text
    • http://chelamela.org/6917801166j97ad.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/giRgRja/vewotam.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ljggigj/legewi.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/99dbf7a7df9e62c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_3b70b372e9714935bd894f5f6cf36169.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_2b05f5c1476447e6bb101b77262891dd.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_7c3c3626a3984c5bbfd702823fbda630.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b4c95e3b1ad84603bcf76558371e56aa.pdf?index=trueIn PDF document text
    • http://bujekotu.atwebpages.com/95243672916.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_d1aa29b25c854fc79481d1272154f20e.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_18cedd71e5a74dceb2e5ec432801ede7.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_312b7ce452ad4857a379e8718100ba26.pdf?index=trueIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/polaris_ranger_glacier_pro_plow_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 5412 bytes
SHA-256: bf790cb7cd7b1465a66358f0442f55339d03fce1a7c6077d127a9e5f1370c378
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 12168 bytes
SHA-256: f5a903d5c4eb29331868100a91dd0d0a6eb9e50fd6b12b17b07db91f8343e615
font_02_sfnt_off000156fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FC 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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