Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0afcbde26a2eda2…

MALICIOUS

PDF

72.9 KB Created: 2021-05-01 03:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 443a05c03fdfba169a95f50d010ab0ed SHA-1: 05c4a742de8dc1f4ce17d66a91bfb9531b1bba48 SHA-256: d0afcbde26a2eda266e74dceaf6289d2ecf6f919b2b7f487c30a99ff0b10fc94
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The primary malicious URL identified is https://resalured.ru/strik. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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://resalured.ru/strik?utm_term=how+describe+a+bar+chart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fe1af70ebde3.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/monsters_and_magic_rpg_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fe2cb3a4409f.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/69716685380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_6056f5fc060ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5ff8f6f5bd957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0064ec65-a1ca-4124-b5c5-26818cb38f87/ketije.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/cardite_rhumatismale.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/research_methods_in_psychology_book_download.pdfIn PDF document text
    • http://fudojozijenabux.epizy.com/ledolimivopixiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/20926562576.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/casio_fx-_9860gii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3a780b-d844-4f19-8f7e-448bb9a35aff/alkaline_diet_plan_recipes.pdfIn PDF document text
    • http://kenakazukigixow.rf.gd/biblia_apologetica_de_estudio.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/alaska_berry_picking_guide.pdfIn PDF document text
    • http://rikuworubit.myartsonline.com/fundamentals_of_analytical_chemistry_7th_edition_free_download.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/accounting_information_system_syllabus.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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 5188 bytes
SHA-256: bfa9d11575539566a017ab266dbb8e9305c002568aa0cb890707331da48e39f0
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10848 bytes
SHA-256: 3ad1958db43a26a7d069a7b881ab9a24af505455a5932646a41405dda87ae792

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