Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b1a00da8c9842f…

MALICIOUS

PDF

73.7 KB Created: 2021-06-12 16:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f8d485965d5c8c66ffb98eae54a086 SHA-1: 80868623cdec29ef360e3acfb0f3fb0312fed222 SHA-256: 28b1a00da8c9842f47c924ac696573d742cedd8a1635953122af8f1d92ee7b4e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'irlanc.ru', which is likely part of a phishing or scam campaign. The PDF structure also suggests it is part of a link farm, designed to distribute traffic to multiple external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=reading+fever+ielts
    • https://cdn-cms.f-static.net/uploads/4384037/normal_6047627b5ed2c.pdf
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ffdd1051a890.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fd60c75f145e.pdf
    • https://cdn-cms.f-static.net/uploads/4367964/normal_60bc8ef5b6c05.pdf
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fdfce0fad1d6.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fdbdf6990622.pdf
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6039b79eadd8a.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_6023457e2745f.pdf
    • https://cdn-cms.f-static.net/uploads/4488133/normal_605aa37cf185e.pdf
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/b2c1903.pdf
    • https://moxolodoxezem.weebly.com/uploads/1/3/4/6/134678964/1b33c4.pdf
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fd1043fe41f1.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_600f1449cc569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4fa1dc85-ee2b-4141-94f5-5b2493bb03fa/niveles_de_organizacion_biologica_ppt.pdf
    • https://uploads.strikinglycdn.com/files/128408af-dcd4-41b3-ba96-4b501d595cd5/delorme_inreach_wont_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/06802245-bdef-4c35-84c8-f71b39a55521/34015761596.pdf
    • https://uploads.strikinglycdn.com/files/e87178e8-fb62-4ec7-95c6-9266c3960a36/why_wont_my_hp_deskjet_2600_print.pdf
    • https://uploads.strikinglycdn.com/files/ca0c2037-95cd-48e2-9363-770d9733d30c/pitajutasuvaba.pdf
    • https://uploads.strikinglycdn.com/files/f171ad5a-02ca-4939-8b09-823d5df9098b/61275501931.pdf
    • https://uploads.strikinglycdn.com/files/1094401a-17a2-44ad-9201-7aa6332df71f/project_management_software_for_small_business.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d0.bin
3eb926488eda6c43098076c94cc2b7ba7fbfb477bcc6ba6522a932d6e8a7ef86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 5144 bytes
font_01_sfnt_off0000f375.bin
f59b5b5a5f98818765a566114854e24a9ce8278bedcc92ad874bf7dcc2c22ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 11952 bytes

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