Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef918aad0a5cd7d9…

MALICIOUS

PDF

69.3 KB Created: 2020-12-18 14:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a0188ebcbb996119545c5774f9194a SHA-1: d1ca5c0d4b0bf823c08fa82eaf8b35271f10e837 SHA-256: ef918aad0a5cd7d917223d5554fd519bfa1a5985bb67ac2f40e384a49e7866ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'traffnew.ru/strik', suggesting a phishing or redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, likely for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the presence of multiple external URLs points to a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://traffnew.ru/strik?utm_term=ap+psychology+2004+multiple+choice+answers
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/4269452.pdf
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5fc10eef6fc51.pdf
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/baa5480c8e5c046.pdf
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5f8c0c42b2f16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/fasanag/a_companion_to_forensic_anthropology.pdf
    • https://static1.squarespace.com/static/5fc0e844cd1e280355d45049/t/5fc808654041a358cd864738/1606944869822/electricity_meter_box_requirements_qld.pdf
    • https://s3.amazonaws.com/sabegokek/lalitiwiziwedinude.pdf
    • https://s3.amazonaws.com/varoximu/25491407556.pdf
    • https://s3.amazonaws.com/xuzed/24543627944.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0aa.bin
61015abcf61570da04e446dab7e965a2d731c1b80c93988d3465cae0adc2e2cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 5892 bytes
font_01_sfnt_off0000d4ad.bin
05efb490dba5ae557a87815018ff984e4faf06e4d81040f3755a7065f9958f92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 6116 bytes
font_02_sfnt_off0000e46c.bin
35bbdff8fa7d215c43118e4077cd69ceb7db541d5587d572e1c83b8bc865a9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10564 bytes