Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c57671c82f29b…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 14:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fe193304b07534b48117075d6470a614 SHA-1: 2c0aa7e8bada2b60311de361455b6c2a46a87985 SHA-256: a50c57671c82f29b2e30791b5a4d5f5e1f8b8b504d5784d8908d565a7f28836f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on 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 through these linked documents. No scripts were extracted, but the structure and numerous external links are indicative of a malicious campaign.

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://druttle.ru/strik?utm_term=understanding+by+design+lesson+plan+math PDF link annotation
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/lutame.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/karajuwedowuv.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/5DRrgdG/dukugejigapijadujezopaze.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/jiggeib/drag_battle_apk_mod_latest.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/cr4zkeU/panda_pop_badboon_blitz_level_5_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/hqujbhe/5851709699.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/jhePoNj/beziwigenijukir.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/1121795.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/fd1b72bcbdbef2.pdfIn PDF document text
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/9140840.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/nejopedosukevod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libeganot/34926634907.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/52262166819.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/blackmart_latest_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/ceiling_lights_cad_blocks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/69019079384.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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5604 bytes
SHA-256: 3f32ecda4f1a562d7302a05ad6e45bdacba6a8e064d87aa758beb06ba91952be
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 10472 bytes
SHA-256: 866188458becab28b2139e897d387f1f9a54e03bba448a6d676b900bfb79d58c

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