Malicious PDF — malware analysis report

Static analysis result for SHA-256 905644b3f2ce82f1…

MALICIOUS

PDF

68.9 KB Created: 2021-02-14 13:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5131749c2fbdf55714c1ca457b56d4b2 SHA-1: be8cf25e91c254f1dd7de30306ab357044d42e37 SHA-256: 905644b3f2ce82f13f9d59d299fae1468fe50bd1f4106b0ff87967c9f31b59d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common tactic for distributing phishing content or second-stage malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/wb?keyword=carr%20manor%20primary%20school%20ofsted%20report PDF link annotation
    • http://idealslimitaly-official.site/78976501298s7igb.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/5084027.pdfIn PDF document text
    • http://flathead.us/77564520661a6kh1.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/90253578855g03ns.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/kalidugilizep.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/a0aeb476c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/gcKEihD/helix_spiral_ball_jump_3d_apk.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/1f4e14c13ec4.pdfIn PDF document text
    • http://autoport76.online/653738969523vgdl.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/7a879b36.pdfIn PDF document text
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/0baf6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_60054f6ef2e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/LIhgDgg/35852230921.pdfIn PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/witavumozedabogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_6001bfca33a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe1895f666bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fcc1b6984ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 5404 bytes
SHA-256: 6cd03603add35ceb1b90724e6be939768c532827b55cfc4a0e3d196fffdf710e
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 11308 bytes
SHA-256: 764379b675a01387a8104933133cf7cacb0242c85773a345f1dfef9e02631360

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