Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76a819d69cef6e9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-30 01:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 47315929dace4c19a34afda273133420 SHA-1: 0bd8b1ff9fdb56f379719f0b5904cb14eff58dd7 SHA-256: a76a819d69cef6e9ed211cd8e1037517a97b8682f20e18910c9cd1746924d08a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=the+boy+in+striped+pajamas PDF link annotation
    • https://cdn.sqhk.co/givifevulo/f4n0Vih/fire_emblem_heroes_resplendent_linde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_602f7bdd0f106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_604eadab32ece.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/Lg5icvV/ralewagikumukuwitijuxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_6014251981187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_6006a475b2052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_60472327a8b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fd0b26f98b79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dewonatazuji.epizy.com/raisin_in_the_sun_walter_dream_quotes.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_36e36c1f05e5495099384e7852edaf81.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_7ca6c788b2e74625b650b33fe3d2b097.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_3779d331d6df4eb7b9a8282f6a86b2c4.pdf?index=trueIn PDF document text
    • http://duvexarido.epizy.com/vavemijuwobexeduxolu.pdfIn PDF document text
    • http://pababevo.epizy.com/16056151466.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_3d8a18a88a954fd68f172186ac5dbe0a.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_4b283fe7e5b54612a1d0111d47efee0e.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_7872069e2ca74392b0bb1ab2f1736ce7.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_fef05849f46b412bad8c21b1c3f7170b.pdf?index=trueIn PDF document text
    • http://pajuniwosedi.rf.gd/fetodunezod.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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 5436 bytes
SHA-256: e206e4282fbeeefbc62ded17d0b701e733d0e008edd6790da2d4707940a9bd17
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 11536 bytes
SHA-256: 84afd1cbd3c4b99b6426526582839186e83702e49a6127fff7abb296016a55ba

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