Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae0871953aa93c6…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 11:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ad1e3ee8e19de6f739e9b70ed0b27c79 SHA-1: b18c46f850230b1069c12fc458152083d3267392 SHA-256: fae0871953aa93c60f20d387a8f5da215a1862b66249affe6a2824608a4a5780
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=hard+sayings+of+jesus+list PDF link annotation
    • https://cdn.sqhk.co/juxerawabuf/hIjhLeo/i_wish_you_were_here_lyrics_one_direction.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/tovipapubebatumas.pdfIn PDF document text
    • http://igcopyrightforhelps.com/sniper_ghost_warrior_2_cheat_engine92e1e.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/natoruzixokibep.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/gapiroramedig.pdfIn PDF document text
    • https://muruvarulem.weebly.com/uploads/1/3/1/4/131406835/binozivatadenibusib.pdfIn PDF document text
    • http://ooovseanalizi.ru/android_auto_wireless_projection_hyundaiaczhz.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/wufotijuf.pdfIn PDF document text
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/1c3ac2311e26e71.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/3384457.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopinakitiwodad.rf.gd/deodar_cedar_planting_guide.pdfIn PDF document text
    • http://sadefevofog.epizy.com/chronological_resume_sample_template.pdfIn PDF document text
    • http://sijopar.epizy.com/16365956556.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 5212 bytes
SHA-256: bdf58366f4b4fe77fae4ab996262c832e7f6756e6a571d58344bc66ea924d390
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10556 bytes
SHA-256: 06db310b8a04617a426c255fa607aa73381f6343613d38f992c9fdd3887e01ea

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