Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf57dcd1d66592e8…

MALICIOUS

PDF

60.4 KB Created: 2020-11-24 04:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7543d9fdc9642bda4c4d4f5ff577c9c1 SHA-1: 0f060d5f20db4545884ffbb533daf6ddace18724 SHA-256: bf57dcd1d66592e83c33cbdb2d207121310676459d806683ed3702de3bfad56a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with the primary suspicious URL being https://trafficel.ru/strik?utm_term=lego+batman+an+enterprising+theft. The heuristic PDF_SEO_LINK_FARM indicates the document is part of a link farm, suggesting a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=lego+batman+an+enterprising+theft
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/8599738.pdf
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fad4fbeb388a.pdf
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/xujuwijozek.pdf
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/vakuwumetirogilubufi.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5fa4ac1f8dd8b.pdf
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f97dd1e782de.pdf
    • https://cdn-cms.f-static.net/uploads/4421224/normal_5fa0e5f870c97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/47936147-f370-4563-b501-49bfeba0102f/the_kidnapping_of_christina_lattimore.pdf
    • https://uploads.strikinglycdn.com/files/aee71955-f9d3-4482-9a55-1fbc55075cf0/97395135881.pdf
    • https://uploads.strikinglycdn.com/files/03f20193-9cd7-4c09-9247-52d5f7b526a4/cartas_a_um_jovem_terapeuta_down.pdf
    • https://uploads.strikinglycdn.com/files/296cfed9-3b18-4874-8fff-aabc77e7d6b2/91830969609.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/xufifipulunez.pdf
    • https://uploads.strikinglycdn.com/files/ca10e98c-4d60-423e-b420-b23c9ab2301e/64896848127.pdf
    • https://s3.amazonaws.com/lemefofutomapox/nixon_tide_watch_user_manual.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_off0000b315.bin
6ed84acfa4a3a9db9854e07b454d3b46205de3180c472af68544cec872058a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 5364 bytes
font_01_sfnt_off0000c52a.bin
d811d5a7fa9eb14192afeb305609f9a4d2e23d97f2729a619482794c66696c10
pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 9308 bytes