Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c5408488ef7b66…

MALICIOUS

PDF

83.0 KB Created: 2021-02-25 09:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80dfaff03a51b660f6033495be1c6269 SHA-1: 2dc4ad11aab34e81ba70f6df476dfe8cb250a6a2 SHA-256: d2c5408488ef7b667bee158ecf85c0199accc1a73d1edfd121e8ba1c567faac7
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 domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/award?keyword=sharp+air+conditioner+manual+crmc-a489jbe0 PDF link annotation
    • http://sevazumemozoli.22web.org/fufaxoko.pdfIn PDF document text
    • http://pobuzajabazuwu.iblogger.org/ziwabusubebikow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_6035084d3e9fe.pdfIn PDF document text
    • http://bepebeku.22web.org/38105830372.pdfIn PDF document text
    • http://xabisafeb.22web.org/letter_format_for_seeking_permission_for_internship.pdfIn PDF document text
    • http://rmk4sale.xyz/9080165625701ja6.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/75795036884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37c5b87ac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ff05d2df3834.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/quantos_litros_de_sangue_tem_um_porcsgc5w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc8685619126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff67ab01c9ac.pdfIn PDF document text
    • http://sozadulowen.22web.org/94096636077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisazabe/bharata_simha_reddy_cinema_movie.pdfIn PDF document text
    • http://voginafukut.rf.gd/gawesibo.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/birupujotimezodakedexiw.pdfIn PDF document text
    • http://daxotumolurotaw.rf.gd/16166350792.pdfIn PDF document text
    • http://marilineme.epizy.com/kunajusiragikadij.pdfIn PDF document text
    • http://kugefosames.rf.gd/garmin_78s_manual.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/datiles_informacion_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/1310172099.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/drowning_trophy_guide_ps4.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_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 6064 bytes
SHA-256: c6f78c221f0b780cc8ec981dc179ea22a1be88f4718a1ca46a429a340b47e0c6
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10704 bytes
SHA-256: 3633082527b9cfb6749dafab7c86ac1e77a74911f252e5f4dfb58c7d361b924c

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