Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6537d7dcd57ef1a…

MALICIOUS

PDF

65.8 KB Created: 2020-12-23 19:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d5495abc614d2c380ef27a7c1d7905 SHA-1: 3e70ef8c72da3f51a5408997141a0d25a5ad12fd SHA-256: f6537d7dcd57ef1ab5b22e559f51dee2078c43823c0aedbd724d1c5e96b38e5f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious or phishing content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The primary malicious URL identified is traffnew.ru, which is likely used to distribute further payloads or redirect users to phishing sites. No scripts were extracted, but the structure suggests a malicious document designed to leverage external resources for attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=masha+and+the+bear+english+birthday+party
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5fa26a086d528.pdf
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/xetogifijeraramisoku.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/sazagi.pdf
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5fcf8172ef0e6.pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/donafeji.pdf
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/2844462ad2de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nowokil/fitbit_alta_hr_instructions_manual.pdf
    • https://uploads.strikinglycdn.com/files/facd6c87-085e-4619-8cf9-05f4b73a7b28/english_skills_with_readings.pdf
    • https://uploads.strikinglycdn.com/files/6ebf977f-8b39-48c3-8ec7-dd1a21c26742/60517532446.pdf
    • https://uploads.strikinglycdn.com/files/2a0cc10f-da94-4246-9506-25e391b64679/livro_de_direito_empresarial.pdf
    • https://uploads.strikinglycdn.com/files/6c898114-f656-4486-b600-a49c1a679527/zanusavekemav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f0.bin
92eece6ab819a01c2001e06b678dc594847fe5a0129464366fc1a03f2160bdd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 5144 bytes
font_01_sfnt_off0000c853.bin
47c78b4e4efaf27dd8282fda18f8db2f3a835cadcc6f3cdcf31eab985f81aeb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10612 bytes
font_02_sfnt_off0000ec2e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 4324 bytes