Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6469fa27aa0d0e5…

MALICIOUS

PDF

83.0 KB Created: 2021-03-02 23:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bd236c10608e0c99df4e563e6c673ce4 SHA-1: 668be43823184b776302547b6b813041fc02fe1c SHA-256: f6469fa27aa0d0e566b35685a350c3422208ec4fc39a0018cee7541cfb36cabc
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains numerous embedded URLs pointing to various domains, including a known malicious redirector at 'https://crophysi.ru/123?utm_term=corpsman+mos+code'. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted from this sample.

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
  • 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://crophysi.ru/123?utm_term=corpsman+mos+code In PDF document text
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/gogilikifatukib-lolivo-mofugofalut-suzulekumej.pdfIn PDF document text
    • https://pudijamarotu.weebly.com/uploads/1/3/4/0/134000536/a3650.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/ibChc8P/78385629555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_602e7d17e6e82.pdfIn PDF document text
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/1586361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_603ccb28465c1.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/gdfJZxK/dragon_quest_builders_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/ghhfty8/hockey_battle_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/tcicRjf/13968749582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_60112d58aa6a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5febebf52b250.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/K3dYjif/jump_jump_ball_2020_mod_apk.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/3687866.pdfIn PDF document text
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/50a6efd5b.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/fuwaxud_datusurujezej_goruzekesoxa_faxej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 5092 bytes
SHA-256: 077bef8cae49c658b9f3e245daada046a94e96e09881abb16f8f83f1092e28ba
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 11956 bytes
SHA-256: d2527fe707572d3be60203451341c7efda229b0128fa8d8d3768c6f4a5bd3c5a

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