Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ce85efb9ccd9e3…

MALICIOUS

PDF

75.1 KB Created: 2021-02-08 02:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70d524aac1936379ce790cf251f0e9e0 SHA-1: 76097c8198e953f5d3453c59ae24d6d832b99853 SHA-256: 31ce85efb9ccd9e321da47e22c45238bb521f52dfe07b1f14e460e7b40e115d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a significant number of external links, forming a link farm hosted on disposable domains, which is a common tactic for distributing malicious content or conducting phishing campaigns. The document body, though heavily obfuscated, contains keywords related to iPhone battery optimization, suggesting a lure to trick users into visiting potentially harmful 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/wb?keyword=battery%20doctor%20for%20iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fdcb86d7639d.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/RWnIulG/lost_sea_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5ff7daa86f5c8.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/5368ca27fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/jheDKid/guwekezoribuzova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459055/normal_5ff30f30080ba.pdfIn PDF document text
    • http://jixaravaxagisuf.22web.org/fosowe.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/2f8a4a5ffde1823.pdfIn PDF document text
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/rinewejok.pdfIn PDF document text
    • https://nesupopokajore.weebly.com/uploads/1/3/5/3/135394324/2708233.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/444790f7c30d.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/foxapedagiwirepafitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaterojot.epizy.com/caesar_3_game.pdfIn PDF document text
    • http://boxulinizisa.epizy.com/kalalu.pdfIn PDF document text
    • http://girupesoja.rf.gd/asphalt_6_game_for_android.pdfIn PDF document text
    • http://nirirojigupe.epizy.com/38223260281.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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5184 bytes
SHA-256: 33578d01807216e8244258be2dfb1e08cf8b7cb8dc5b7e4caed16574802ba949
font_01_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 11012 bytes
SHA-256: d15b2bfc7244f666c869f851344294de30e295831125ee8a662095f5c305f4bc

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