Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc50f9cc4ce9fe20…

MALICIOUS

PDF

78.9 KB Created: 2021-05-28 04:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9bbd92227472b284130cbc3784ed7fce SHA-1: cfc6f8df7c183862d89085009a3899a938cf4244 SHA-256: dc50f9cc4ce9fe20f75dfdaf321646c2a97ebd9fb31f158a63bdb4ac4594226d
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://baarspo.ru/123?utm_term=stalker+instagram+pro+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459467/normal_604f297266ba8.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/darijavugigabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_6021956937bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_6022ffca403ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_601bc1e19b432.pdfIn PDF document text
    • https://biditojutorosas.weebly.com/uploads/1/3/4/6/134657596/vorenepigeludesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_6035593cdad06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_6069d29828acd.pdfIn PDF document text
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/fozorexosikezud-newenotexo-pojugosurusu-bibumerejawuf.pdfIn PDF document text
    • https://birogiso.weebly.com/uploads/1/3/4/6/134694086/rusefan-lesit-digamemuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5ff186b28de62.pdfIn PDF document text
    • https://nawomabikovuz.weebly.com/uploads/1/3/4/7/134730946/7769657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5fcf36327c8ca.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/6cac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_5fdb7b9cc0cd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fee62a2ed192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fcc6f8695d3c.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/5545192.pdfIn PDF document text
    • https://weratirotiset.weebly.com/uploads/1/3/4/3/134322017/jebulunu-xewati-vomabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470035/normal_5ff4a8062aca5.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/wakom_dekulen_vibetabuvune.pdfIn PDF document text
    • https://bobubimusibobu.weebly.com/uploads/1/3/4/7/134715312/vilolidekoro_lominoxos.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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5308 bytes
SHA-256: 3cb72d141e9cbb3746514843c16b50b0ccfc1531a9b24a731313db8318ca2043
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 15948 bytes
SHA-256: 4d596253763ad85b2ca9a8b4367dbc433f6ae802965b494a02e9e45f9036a22b

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