Malicious PDF — malware analysis report

Static analysis result for SHA-256 15615909fd9150b0…

MALICIOUS

PDF

72.8 KB Created: 2021-04-02 10:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 594b1406ba577efe546cec8270d3bc1e SHA-1: fdcf9b50fddd1637aac5393a8422fc5a4ed3f3ed SHA-256: 15615909fd9150b0740f75e0a0c7ebec217502054c69228b77fbbda673c45196
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://dafemum.ru/123?utm_term=alyson+stoner+missy+elliott+performance PDF link annotation
    • http://tuwasukam.getenjoyment.net/ucsf_hospitalist_handbook_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601a3a4505749.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/43969171422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601eb645a9fac.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/eieMhfW/zokifutix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_5fcd7e429f830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60228b2ce32a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6038be6c49e66.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/gjBxjdu/voviwajegamuvigedoli.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/conceito_de_abandono_escolar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewabetowa.myartsonline.com/dafapapabi.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/healthy_low_carb_vegan_dinner_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/easy_worship_background_gif_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/9386312605.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/kelizi.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/how_to_make_different_drywall_textures.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 5252 bytes
SHA-256: 87e1ece691fd2def2df69604dce27eda5e751a0b04116650191639c4d1d2e7f3
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 10604 bytes
SHA-256: 94b0fdadfbcdc6e96ddf201c051ceea9d5581581c0595a1bcabf89715b0d5c7d

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