Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaef5dd49dc6406…

MALICIOUS

PDF

62.4 KB Created: 2020-12-28 17:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5cf3f7f1df9006e09ffcfb24281ede1 SHA-1: 5d8309b1bf2c1dfbade0ed84168102a151956e76 SHA-256: faaef5dd49dc64067393905746b2e77594867f989c8697b18bccbbbf11c7488b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to potentially harmful websites.

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=go+chicken+go
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/4614230.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8f610c1b00c.pdf
    • https://cdn-cms.f-static.net/uploads/4414852/normal_5f94be54ac229.pdf
    • https://cdn.sqhk.co/xumobopore/hjbgdjh/daludekosigimugegex.pdf
    • https://cdn-cms.f-static.net/uploads/4465274/normal_5fa7f6624c4dc.pdf
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5fae39fa53787.pdf
    • https://cdn.sqhk.co/wupifufexix/Bjhjagd/30889180821.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5fa9e94f7318a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f3a21dc-89ec-4977-be3f-6011844d0724/50905611470.pdf
    • https://uploads.strikinglycdn.com/files/ca6bbb80-f24a-49be-a8b4-f7e7d2b47fb0/zepivego.pdf
    • https://s3.amazonaws.com/tikofaketonub/kaspersky_security_center_11_deployment_guide.pdf
    • https://uploads.strikinglycdn.com/files/58a477a8-0284-4867-b129-b026451f206e/theme_of_the_twa_corbies.pdf
    • https://uploads.strikinglycdn.com/files/829e175e-f472-424a-b776-256861d8f0a2/dino_online_games_free.pdf
    • https://s3.amazonaws.com/debamijizozexo/28079668398.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_off0000bb92.bin
51bef09f5049e79a5711ef7e4151664c773338bdd6ec06c13401fdeacb69f3ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB92 4640 bytes
font_01_sfnt_off0000cb66.bin
f8145da0b4706f607b181a495589bb11fc5e1b34e1202a3ef973eb20caa0cac5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 10024 bytes