Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b44b3beff6e1981…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 01:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 358a37c7110d43b5d8cde8a0da749282 SHA-1: 1e912eee04cd67ef70637a3a24a040c62532e5ee SHA-256: 7b44b3beff6e19812e5bc13969ebc92f8ffabde704c2942dfbad6600ba2fd2d0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable platforms like Weebly, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are characteristic of phishing lures 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://druttle.ru/wb?keyword=honeywell%20vista%2020p%20fc%20code PDF link annotation
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/780f8cb7d3a229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec836e75f08.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/melozovivo_xiletojodag_xadebodow_resuridola.pdfIn PDF document text
    • http://aviabileti.ru/4345724181970g6t.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/sutobos_kopinobe_lobevav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ff69099b0417.pdfIn PDF document text
    • http://lifegirls.site/kenmore_dishwasher_665_owners_manualupuhk.pdfIn PDF document text
    • http://my-credit.info/sodastream_fizzi_sparkling_water_maker_black_with_mini_cylinderui56k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6033f140ab2a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ff007b21d3f9.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/gujerokofobowum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fc9d7efa6918.pdfIn PDF document text
    • http://remontvorot24.com/leadership_and_management_booksipeyb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601a997a51905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fdd851d0befe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ff88b40da015.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/861de70c7404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5fd12f9153de9.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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5544 bytes
SHA-256: 9cd086a5998fa31c97a14f4e3b990982ef716a1836cbe0c4829df22ed3825d1d
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 11144 bytes
SHA-256: b80d7c6a0fce60bb5e791b28744f7406c049bf33d522d3a8fa1566c2b8514226

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