Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caaf6f5403177d9…

MALICIOUS

PDF

60.5 KB Created: 2020-11-09 18:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c62d4e5cb7500be90f363f22cb71296c SHA-1: 1749c49bdc48015a1d9db31fe5c68f79c1aef30e SHA-256: 8caaf6f5403177d966b0a441f6206478f93d95cf5fc2036ade7417b96c58a742
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating it functions as a link farm. The primary URL, https://trafftec.ru/aws?keyword=urbini+omni+plus+3+in_1, suggests a potential SEO manipulation or phishing lure.

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://trafftec.ru/aws?keyword=urbini+omni+plus+3+in+1
    • https://pamarilu.weebly.com/uploads/1/3/4/3/134322341/01b9fd495dedec.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9e26b969c97.pdf
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/601667.pdf
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f90413e57d07.pdf
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/ebe51d.pdf
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/d1a09c2dada0.pdf
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/9133925.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/13c39e1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/watoti/75982927468.pdf
    • https://s3.amazonaws.com/xanebavifamopez/kuwuj.pdf
    • https://uploads.strikinglycdn.com/files/2914991f-75f7-4cfa-a039-dbc06b34fff6/75847646847.pdf
    • https://s3.amazonaws.com/limewub/9254608049.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/acetilcolinesterasa_definicion.pdf
    • https://uploads.strikinglycdn.com/files/04070861-6e39-4c88-92f9-016dadd19939/zigaduzanunawido.pdf
    • https://s3.amazonaws.com/sukedil/agile_project_management_methodologies.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_off0000b013.bin
5ba862497a8790a40fe0a9b0b5dd88b598d18ad35185d37d7d75ca3ce031b1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 5104 bytes
font_01_sfnt_off0000c15f.bin
858830d815479a8aa696fa3933b27ec36d56a4d6cf0547b2e8779923269c00ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC15F 10868 bytes