Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2937b0242387d4…

MALICIOUS

PDF

75.5 KB Created: 2021-01-09 16:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0334aff0baefff8026c11fc4006fe0c6 SHA-1: 7a22cd50fc4f43781e224cddbb48039d7c828b42 SHA-256: 3e2937b0242387d43c2362e6c2202ba205c29ea18ae9360c8e4901478154c8c2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting an attempt to distribute malicious content or engage in phishing. The primary attack pattern involves leveraging these links to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gettraff.ru/123?utm_term=society+for+investigation+of+human+ecology In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5fef637ab010f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5feb80059c7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/O8haJgg/stick_gunner_stick_fight_mod_apk.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/8620865.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/hbjeOqb/jugipinukatujagudawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fccfd1b2bac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5fa883b0d082a.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/tukonif-pujogu.pdfIn PDF document text
    • https://watilokid.weebly.com/uploads/1/3/1/8/131856522/wiwaxago_gowibi_piwogunogumowi.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/divomuwotidiganili.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/jikofiva_rukasexofevip_tenonorof_refodaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 5444 bytes
SHA-256: 2ea7b6593f0b1f12b41fa1562ec076d432ce4da71bd6a30d30d7ac30cbe0b487
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10716 bytes
SHA-256: f17cc784b18f46a233aea3d6e10bbc252fa3b3aa944adc9bc8ae2de21fe8868c
font_02_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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