Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f895e1fcd1a129d…

MALICIOUS

PDF

83.8 KB Created: 2021-02-02 22:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f4104a8b22cdf4e3d6ae0c87146614df SHA-1: c6f0f56dc5e05cdd502c1a2ba0ec5f454424a4c0 SHA-256: 9f895e1fcd1a129dc8003a1593241c592a649e4d4ab1a99e9c8f5e8f4b61f7f5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that aligns with the malicious link findings, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=angola+kizomba+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_600a6c4490fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373502/normal_5ff338f2a6fdb.pdfIn PDF document text
    • http://mebelintera.ru/gubavelejocdsr8.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/agdC9jh/abandoned_3_the_refuge_play_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/RUGiheQ/mulipof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5fdb63ae962c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemijafuw.epizy.com/bigugamukukirewazirol.pdfIn PDF document text
    • http://jilevatawew.epizy.com/sword_art_online_game_android_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/hd_movies_websites.pdfIn PDF document text
    • http://zerodawoti.rf.gd/tijeverutepedikorofesa.pdfIn PDF document text
    • http://lisuwar.rf.gd/clash_of_clans_updated_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/mipozutafalem.pdfIn PDF document text
    • http://wozawexopad.epizy.com/ordinal_numbers_worksheets_grade_1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 5264 bytes
SHA-256: 1d4d87ef2b5e20418072699b82f0386627f302feb9bf92259b3ad0b34cd46fb9
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 12864 bytes
SHA-256: 7db65152aef8c9c490aa1171493701f1eab068e762fcc6df8f61fc0e5fd7ce3d

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