Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d4fb7b50165b12…

MALICIOUS

PDF

69.0 KB Created: 2021-02-21 12:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb3466abf4394c7c0d4c18823d61da35 SHA-1: 48131b753bf65f511844cd983d73c88bcb453ab3 SHA-256: c2d4fb7b50165b12534acb36765dc5dc86e6d3952219097072fe240c94df1478
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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
  • 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://jacksth.ru/123?utm_term=bible+study+materials+pdf+in+tamil PDF link annotation
    • http://eeeeeyyy.space/rovukoti25u44.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/bzdjcSW/53176872479.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/joanas_leveling_guide_hordeoosxe.pdfIn PDF document text
    • http://13millions-warzone.store/fumuxakisalulitaposonubimbsczo.pdfIn PDF document text
    • http://in-step.shop/vokixonegudevvo2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/Hjbdihk/40757698629.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/hfiiI49/84527506785.pdfIn PDF document text
    • http://italystore.pro/ledanumitazdkdar.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/tivetojazotijut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_600ed62bd8f97.pdfIn PDF document text
    • http://comforfemj.fun/xagufodetuwefupzj9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5ff448135d4e6.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/gmjaRjd/spiral_lucky_block_mod_minecraft_pe_download.pdfIn PDF document text
    • http://prostotit.site/procesos_cognitivos_basicos_y_superiores_resumenl743h.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/1219212.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://wutugegazebezop.rf.gd/telugu_bible_app_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 5252 bytes
SHA-256: 7cb245ebbaf34930a8f4adb6a9f4abe3b78dce8d99f2967a7c5b3c1e31161278
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 9688 bytes
SHA-256: b44809ebf30019a2d06b82081860bf7813dd5f71b2ad5068deb06b207e6c02c0
font_02_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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