Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75f71e9c2ae255d…

MALICIOUS

PDF

95.8 KB Created: 2021-03-20 11:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c3147da61072e95728dfadbdaf709cf7 SHA-1: 201f883179408c45ad2de3671b08f2a71f14476f SHA-256: d75f71e9c2ae255dd8b35550a6029e512d9ac1bd0a4b59b4937129d6ca946df7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs, such as 'https://maypoin.ru/strik?utm_term=hp+photosmart+5510+won%2527t+connect+to+wireless', suggest a phishing lure related to printer connectivity issues. The PDF also contains numerous links to disposable domains, characteristic of link farms used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=hp+photosmart+5510+won%2527t+connect+to+wireless PDF link annotation
    • http://tomandbxof.site/edexcel_a_level_organic_chemistry_notesel1fu.pdfIn PDF document text
    • http://7lessons.space/2793425878kbidz.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/xokeviduwex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6015570eca723.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/PeW5iif/xavupodif.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/bunb7gg/25639746381.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/Ojjjfih/61300783456.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/jajixelebiseferen.pdfIn PDF document text
    • http://supsun-aero.com/73121287299plmyn.pdfIn PDF document text
    • http://fb-copyright-help-from.com/how_do_computers_work_for_dummies91web.pdfIn PDF document text
    • http://3gusevshop.space/arcsin_graph_transformationsje3id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_60392cfac40d1.pdfIn PDF document text
    • http://rte-ita.fun/kuwapojupis5z9o.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/i9deOgU/sims_4_superhero_mods_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_3999b2febc0e40c2a8329b99718e5428.pdf?index=trueIn PDF document text
    • http://kugukokoner.myartsonline.com/ferofomidado.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_4a275782ac5a438ca10e0eaa06c0e8ec.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000146b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x146B0 17792 bytes
SHA-256: 974426795f33c8fca60f9f4711b5cf05c4b07d655adf78b7fbfa90a8e37d5af8
font_00_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 5364 bytes
SHA-256: 3c4a8f57f33600dc1d7ac7af7de77449880096261406de41bdbae1ad733848a2
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 11248 bytes
SHA-256: 36d36d1702593a242e6f7b05331c2becdb182b089641df1d5ac4a4644d0e45fb
font_03_sfnt_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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