Malicious PDF — malware analysis report

Static analysis result for SHA-256 7772476659803cd0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 44a7dcba894dc2917aaa4dfabd5d54d7 SHA-1: 09c6108916d4d868e2fb743ec3c68b2e71a35125 SHA-256: 7772476659803cd002466d3086e51663d2fe50f61c74114afbd52672447cca88
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://baarspo.ru/award?keyword=binet+kamat+test+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601377fdd72f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601a7ad2e596d.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/metaphorically_selling.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/67596562974.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/nomenclatura_para_alcanos.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://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_2d5c30ae1c9e4ea8a67d8a21a2f31e90.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_7f2e646923b1453b803138e8649701b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3267d06d-ad68-4802-b5be-eae0398d4029/monsieur_ibrahim_e_i_fiori_del_corano_film_completo.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_3b4d9db9a44b44078da41f0aa0e4572c.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_d2d6033cabaa4538a0a29f43db40c8f9.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_2d3de9c6b8374802ab8e4b86fae3e8a3.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_6f21e795166b4115b7f091b764ed07a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6affd9e-6f4c-49f5-b457-e9d16ac3d9b0/20554492891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c79789-2120-4e5c-a188-cabd83cca1f0/95148539116.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_7d8cca793b2e4f1dbe866b22e1afe4b7.pdf?index=trueIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_797dbf38fe274b1f95066ca387a521bc.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_8ba316088d9f46d7be8104240931795c.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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 4976 bytes
SHA-256: af1cd40bbbea6d2e4667b960b79bc943dce0bb69184862a997cfd7673ae072ea
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10844 bytes
SHA-256: 77d93079a07c62abdd08709d6ce7b1b72c0b3a0504068eb6a23673dcf78299f4
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71