Malicious PDF — malware analysis report

Static analysis result for SHA-256 694526501b6d0679…

MALICIOUS

PDF

65.2 KB Created: 2020-12-08 00:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3119d445c24364250ef4a643218faa0d SHA-1: 1cee509fbf9d22b59a643d6f63dfde2189815fd8 SHA-256: 694526501b6d0679abd1e2c00679d8886179f7b943d8cff392ee3e3fb66f458b
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/wb?keyword=fitted%20bed%20sheets%20full%20size PDF link annotation
    • https://suvamowifav.weebly.com/uploads/1/3/4/3/134351486/rizeloje.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/duxezunufisevozatej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fc9e5fae8038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f89a41d76022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fa30ba6f1d30.pdfIn PDF document text
    • https://botebagi.weebly.com/uploads/1/3/4/8/134870763/nawunowazow.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/8560432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5faf5f893cbac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fb58426dbcf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388178/normal_5fc83593ae630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f6d556-907d-45d2-b4bd-757355833702/lijusuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7122d6-f439-425f-a5f9-80beceb93675/2953057460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81968455-27e6-404e-8816-942f80bf3b4d/apostila_de_eletrica_industrial_senai.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/88416269675.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_off0000c570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 4832 bytes
SHA-256: 04e2cdb371410f04b9033f81ea38e7444d280504f133bf454dc03627ddd2e0c4
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 10036 bytes
SHA-256: 1b616f8ae999b49dc154e88548fcaa348058eb50c7f9a764caaea35673027728

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