Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a967e1108d3ba85…

MALICIOUS

PDF

75.6 KB Created: 2021-05-15 19:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f052f3d20b25584bfcbf50a4195394a0 SHA-1: 15f10740bba4293ac573dc4a09bacef45d6e86d6 SHA-256: 3a967e1108d3ba85e74b6bc3279ac83c44c450346d7da23596ca90fd00e7f3bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are embedded within the document body, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=stress+concentration+factor+for+circular+holes
    • https://cdn-cms.f-static.net/uploads/4408601/normal_601a3d4b887e3.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_600be7f7cfb8c.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_602017a11450a.pdf
    • http://kuvelopomegemes.iblogger.org/architecture_101_book.pdf
    • https://static.s123-cdn-static.com/uploads/4481406/normal_60038d896ff0f.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd785e70be3d.pdf
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6025e46406521.pdf
    • http://zupiworifokovaw.22web.org/16234624425.pdf
    • https://cdn-cms.f-static.net/uploads/4404727/normal_603573fbd9c98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d851918-278f-4cf3-bf35-933c6841fb0f/73152851973.pdf
    • http://bokizimumizom.epizy.com/52622410216.pdf
    • http://fomigidaxek.epizy.com/mejit.pdf
    • http://sabedixuj.epizy.com/mastering_chemistry_chapter_13_answers.pdf
    • https://uploads.strikinglycdn.com/files/880eb911-1b65-402b-b8fa-5b3c58108b6f/toziladokiz.pdf
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_a245d89d25e4493681c765f4eff73ee6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3627914e-dc70-4749-bca4-8f166006dad2/pagibevu.pdf
    • https://uploads.strikinglycdn.com/files/9a119b83-c883-4e55-98e8-757b4c2f0448/bedtime_stories_for_unborn_baby.pdf
    • http://vorakufi.epizy.com/40713786488.pdf
    • http://fepoxojosatomu.epizy.com/aarariraro_video_song_hd.pdf
    • http://jokiperone.epizy.com/analise_swot_excel.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_6d9f2ec01b904b6783d289bc907aa3ef.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fa.bin
390c39d731e0384e4f9e8d5ea3c3173606e8c8b6d137ef9e51cacd41276b0511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5072 bytes
font_01_sfnt_off0000fa33.bin
d1ef698a11f78fee35465eb93d2a0df641ee2635b500c0e2e9d07a805ed03f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 11300 bytes

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