Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c012c0508d528c…

MALICIOUS

PDF

68.1 KB Created: 2020-11-18 07:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 572f83dc610e5f82fcb0d485ef916997 SHA-1: 70b6a65b3dba53ee550cd0b2a7f99ee6a33784df SHA-256: 37c012c0508d528c3a0b2762eecf1b1bd80e10b36be3f22009f8c9b695bb7e39
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document structure suggests it functions as a link farm, likely intended to direct users to phishing sites or download further malware. No scripts were extracted, but the presence of many outbound links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=culture+of+poverty+theory+examples
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/begularudexe_derijafotadux_soram.pdf
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/nasaxeladaxugaso.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/makotu.pdf
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/d59199924dc12.pdf
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/nitutowevabewezipomu.pdf
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/8409430.pdf
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8dc033288dd.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/posumiwuwolosurun.pdf
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/869cc5877ecfdb7.pdf
    • https://lamuvoraraxuz.weebly.com/uploads/1/3/4/4/134486612/dimoba_sezevibu_rajukujupepo.pdf
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fb2968d6ef3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megelugik/pudadotafixumiroz.pdf
    • https://s3.amazonaws.com/henghuili-files/stopping_by_woods_on_a_snowy_evening_text.pdf
    • https://s3.amazonaws.com/bokexizometun/fezafofakikuwuwovam.pdf
    • https://s3.amazonaws.com/xanebavifamopez/visejaxanujopisaveradobe.pdf
    • https://s3.amazonaws.com/wekibik/3504408920.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2c.bin
833a40512cda1dc1b2cace5fdfa3de1d5193df58bfa56a21d7344a0418d02939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5276 bytes
font_01_sfnt_off0000defd.bin
3037c188a93235e0bdca5c4082793e4bf1c84db6a927875011fa0211cf6cbcc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10900 bytes

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