Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4a5db283895737…

MALICIOUS

PDF

74.8 KB Created: 2021-04-15 03:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 036d05a9fc8df4efd2156c17d82cc5b4 SHA-1: 5113f25e6c18b6ccda0d7903f75d64d89cd2b7ef SHA-256: bc4a5db283895737ab0a307f8550dff5b0e0c0a3d55a67bbbaf84437da51642d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The primary URL, 'https://zajinet.ru/strik?utm_term=mfj+989c+parts', is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution attempt.

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://zajinet.ru/strik?utm_term=mfj+989c+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479454/normal_60423e3c199b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_604d1ff00c8ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6041cac60a106.pdfIn PDF document text
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/e51277f.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/4heDjhf/airport_city_game_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/iiQQ28S/78109591176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5febf292c0290.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoziku/FqUahbY/92642647120.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/oXO6qAy/battle_realms_1_free_full_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f592e7b33.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/3799118.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/1715060.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/2664092.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/hjhLatb/iba_arbitration_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hbieWic/2610562457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_605808c57ba7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_2066b69b7de047beb8aa266230772bbd.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_dfaacfe507294acc91968607c008fca1.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_0274cf5e5d4447e69b6f48ceacb3bd72.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 5408 bytes
SHA-256: 01ea52828fb17b396508d5ec7fb1772fbe99bb1d7d7b83116af4cd3d20a96f19
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 11512 bytes
SHA-256: 03ad4001a25959fc1a819f5e6217ba1c40b85032755121423d7040b37ca64b5d

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