Malicious PDF — malware analysis report

Static analysis result for SHA-256 245a00a4e9770674…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 23:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c139c44b5a378f751d35706b285858e SHA-1: 5273e0a2dc0deb16cb59a3ee4f97e5b2eeda2ebd SHA-256: 245a00a4e97706744a8a129c4d580b93e24b188e5d8fe11dfebb4bc0a71c63a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or a phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=computadoras+en+walmart
    • https://cdn.sqhk.co/ziriziwebu/fjhkQij/frases_chidas_tumblr_cortas_para_fotos.pdf
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b0bc2604b.pdf
    • http://stroymarketmetal.ru/dinewaxunofijuronogel8h1x.pdf
    • https://cdn.sqhk.co/moturalogupe/IRhghKk/chinese_dramas_to_watch_2019.pdf
    • https://cdn.sqhk.co/vemudumuxixu/biajfaR/51486177869.pdf
    • http://im-marceting.site/338939471268jew2.pdf
    • https://cdn-cms.f-static.net/uploads/4418991/normal_602c993f17156.pdf
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fee78456d5df.pdf
    • http://wowogobofomufu.mygamesonline.org/35546016940.pdf
    • https://cdn.sqhk.co/kolokejo/gjvdqae/world_cricket_championship_2_wcc2_similar_games.pdf
    • http://kivafijap.mywebcommunity.org/soft_tissue_cephalometric_analysis_for_orthognathic_surgery.pdf
    • http://wellwork.site/54257873331f96cf.pdf
    • http://jawixogu.mygamesonline.org/deresomoxu.pdf
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5ffe77ee647a8.pdf
    • http://autoport76.online/anger_management_certificate04qob.pdf
    • https://cdn.sqhk.co/guxudakakali/cjDgiwv/73863219283.pdf
    • https://cdn.sqhk.co/bogulevim/f6Ehc7d/great_farm_carlisle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_63731fe6e8be4025bebb24f88d7b6eb8.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_681ab577fae243cabbe1d6ccf2ce3ecb.pdf?index=true
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_593104cecb864acca01ab06ff45537c1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d2.bin
9abecbb3eea894d5ee4c306d09e8304284e9d9721810110f63d7e9aab77e9982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 5100 bytes
font_01_sfnt_off0000f21b.bin
7430af2e589eea042d982cca647fe6bda0f53d0fcd9f6f162cccbae8441208b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 11620 bytes

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