Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a2593b4591aff…

MALICIOUS

PDF

75.3 KB Created: 2021-01-26 21:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 09497cf0b41a53d677bb7a37420f20f3 SHA-1: 4ad4128f053e30521dbf8446304390f7338364e6 SHA-256: 916a2593b4591affdbee0b1ec4f198bda67ebee9da895f4773d8abe215d76c57
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to disposable hosting, disguised as a guide for downloading GTA 5. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://druttle.ru/123?utm_term=how+to+download+gta+5+apk%252Bobb+for+android PDF link annotation
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/wupexuke.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/5620569.pdfIn PDF document text
    • http://1fps.ru/bekabv0lbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5fe8f1e74afc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5fc6730d2f3a6.pdfIn PDF document text
    • http://shlifovka-pol.website/prepaid_call_promo_smart90k1g.pdfIn PDF document text
    • http://helplnstagramoffice.com/x_core_galactic_plague_apk3bcho.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/kakagasa-siwewaf-zuvabix-dejux.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/8395280.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/9oSgehg/smart_trickle_charger_for_car_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5ffc014100b0a.pdfIn PDF document text
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/fc28ff1220dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5fd7df39ac2f6.pdfIn PDF document text
    • https://jerarovisiva.weebly.com/uploads/1/3/5/3/135332562/venodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_6007173a8cf3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5412 bytes
SHA-256: 838bed2a118b973414795591dbe9fbdd1c55f4d7f4b2d443c2f800909783d303
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 15432 bytes
SHA-256: 36562c223651f6eb53924f0d0a1c121fbb518e0743024b198b1622f65e1bfe1e

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