Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b7fadf05939385…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 03:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d944ec290ba0c3761dd598b7bf2a7a2d SHA-1: 57ddfb763b1587436c97b8f1be34d4f967754aa3 SHA-256: f1b7fadf0593938556c72c6ff929165c4bda906e68b31b3ea51729ea33cd617d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/award?keyword=convert+pdf+to+kindle+book+format PDF link annotation
    • http://znasila.ru/71694061920fymkz.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/dakofazajavuxufot.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/badavo.pdfIn PDF document text
    • http://arm-watch3.club/30592832002teo17.pdfIn PDF document text
    • http://reduslimitalia-official.website/69012772444j2g35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fccebf6365e2.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/nancy_madore_enchanted__megigzve.pdfIn PDF document text
    • http://coolmag.biz/14550534337vyom5.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/65556906770.pdfIn PDF document text
    • http://rankingcoach-seo.com/mizoweksco6m.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/how_globalization_affect_business_ethics.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/why_is_the_short_run_aggregate_demand_curve_is_upward_slopingxhd7w.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/washington_state_university_ranking_world.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/badojifasinusomext6qtz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fe6f6e79aa77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatinilub.epizy.com/40565707387.pdfIn PDF document text
    • http://rubipupajet.rf.gd/tezogufewexomukobunowe.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/what_are_camera_shots_in_film.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/primary_secondary_tertiary_quaternary_structure_of_proteins.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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 5176 bytes
SHA-256: 024ade4cb5df2f4ac874af71843534078850369b91cce559e1102bf96a24822b
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10944 bytes
SHA-256: 071205abfb7e7e001facfe4d948e17662cc960b71f8978a3fb73e1aae0e4e20d

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