Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2b99535e893ee0…

MALICIOUS

PDF

75.3 KB Created: 2021-03-02 19:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1be0f1218e9c1c8de19c4e94c5b0c84e SHA-1: 8cb6ea148fdf592d028ca46f81827b92aa480bb6 SHA-256: be2b99535e893ee0a40c303e6d6924acea6dd6c871d4a7cb685f00e7b5dd407f
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://seumenha.ru/strik?utm_term=how+to+heat+an+endless+pool PDF link annotation
    • http://lofoporubatul.mygamesonline.org/34841674388.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/hDyzsgc/free_movies_on_youtube_action_pack.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/dasuxanata_dulijazawaror.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/ijabZ4x/photo_tools_2.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/nowedu_demebow_gukowowixon_rapukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6015e21fdd7d1.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/dugep-dasul-lizobome.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/fifihhf/2266647890.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/wifujuxufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fe1d6de89f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_601d5e9586113.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/pezoned.pdfIn PDF document text
    • https://wuzizado.weebly.com/uploads/1/3/5/4/135401221/af9bbe6.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/baruponozex.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://kofaxafogi.myartsonline.com/44357302651.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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 4744 bytes
SHA-256: b9d79f8e5f0f1f5e59ab70543dc0f67ac1346bfe49dd32e09f709b662104b9e9
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10556 bytes
SHA-256: 5adaa0b54f515ba26f70001d2e7d0d3a5e5eb560f1ec16282202890a78168ab2
font_02_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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