Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3440f0d9ad43bb4…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 08:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5813dd3cdb02e83b44a8af36a933f4f1 SHA-1: c0f1ec0d3529e7f40b8c7683273a855fb84cd7c0 SHA-256: a3440f0d9ad43bb48067c7eef93b6ff91ae50a2d433fec4a11b8628a99fbaaf8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to a product manual, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=weber+32%252F36+dgev+manual PDF link annotation
    • http://munupesifak.22web.org/jevtana_package_insert.pdfIn PDF document text
    • http://lofokumado.22web.org/kewitamatipumapoguvokanet.pdfIn PDF document text
    • http://losusosemusisi.iblogger.org/peduxewud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6022361dc7f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_6056424e89ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_603be5f6c93d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_45860c658a454a1e8412ec3eb35b1da5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cbe3b8d-e0f0-4ddf-a9ca-9500d28b3de6/leturemevak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7086a6-a908-4bd0-9885-decad0d06bab/nordictrack_x9i_treadmill_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582a90fd-b806-4edd-80d9-947a590aba8b/ruvojigulijaweledab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9832ea70-21f0-449d-86bc-e01b7d88a1d6/coleman_propane_grill_roadtrip_lxe_portable_gas_grill_manual.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_caf5135ceeb945a986cd4df2be98be91.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_ada5dc89d2014167af385780d139ac75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a210ca6f-b5a5-473e-b690-5322955f20fd/moultrie_s50i_game_camera_reviews.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_8beddd6410284d418115160dfc0e5a57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cd71a8-ba00-424a-9689-52f1b002911b/43841596378.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_694bfd5f667440acbeac992b88ea8fbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2491d88b-aec0-4eb0-9290-7778f13563db/lewugagiju.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/70903916608.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 5668 bytes
SHA-256: fb24960761eb6b9e8ffe2e5f6c684383c01939e8b6facd8809af86508fb14479
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 9936 bytes
SHA-256: 102616a5c65a646e5418bec3886659e80de58509e0da4f37fb2c3002f63c1bd0

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