Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5aa576e8778c4…

MALICIOUS

PDF

73.0 KB Created: 2021-03-30 05:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f0847e07229dc58a18583326d1f60dd SHA-1: 802b20678d3a73ae85c24ff1f0cdde30a45be3d8 SHA-256: 2ac5aa576e8778c489eff0cb21d9b9ea10ff75b80b426d49e6bebb258d382173
126 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 heuristic firings reveal it functions as a link farm, embedding numerous URLs, with one notable example being https://xajibur.ru/strik. This suggests the primary attack pattern is to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://xajibur.ru/strik?utm_term=les+mis%25C3%25A9rables+2012+trailer+espa%25C3%25B1ol
    • http://fragcups.com/full_quran_with_urdu_translation_audio_mp3_downloadu9hkl.pdf
    • http://pedron.fun/6110589323719erb.pdf
    • https://static.s123-cdn-static.com/uploads/4383930/normal_5fed93aa7cc52.pdf
    • http://espaceabone.com/bowiwubekawugs5ozs.pdf
    • http://agent-ritual495.online/c_oops_interview_questions_and_answers67qcn.pdf
    • http://mebel-albero.ru/how_to_be_an_explorer_of_the_worldwh4gp.pdf
    • https://cdn-cms.f-static.net/uploads/4420602/normal_603b36daa603a.pdf
    • https://cdn-cms.f-static.net/uploads/4487381/normal_60296420a2fef.pdf
    • https://cdn-cms.f-static.net/uploads/4476142/normal_604741272cba9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wikatefa.epizy.com/blunder_synonym_formal.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_7eb2b4d1db224ee4b8641a0b5d4d0ea4.pdf?index=true
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_2f548149f5fa478e8d2395c589056c35.pdf?index=true
    • http://befopol.epizy.com/radish_life_cycle_worksheet.pdf
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_29cccd034c244172b296b60cd4ec9149.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_7026aff0e4bf4dc3b83561067a055b90.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_45374bd8279a457c9a16daeeff6e68c3.pdf?index=true
    • 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_off0000dbd0.bin
d22aa221331432413059f5fdbb18ec42567a3680176fc8e27e15e2703a6a24d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 5728 bytes
font_01_sfnt_off0000eea6.bin
0831f8c65a1588a6f74cb942d0d52a22a073296a3186d2659cc697466aad1ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 11440 bytes

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