Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f706cb496503ae…

MALICIOUS

PDF

65.8 KB Created: 2020-12-15 09:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b8dc6687bbccbaf9e5e58791847c9e2f SHA-1: ea2d58400ba14032e8ffa3408bcc74f82aa4d51a SHA-256: c5f706cb496503ae915646f13e200cd13fceb517b08fa55e2983b5f995ca7f6e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'traffine.ru'. Another critical heuristic indicates a PDF link farm, suggesting the document is part of a larger SEO manipulation or phishing scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=4+pics+1+word+6+letters In PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/4152112.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/1869394.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/vifeniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dd04ee40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_5f9c46f3c388c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d1e50a-5cf5-4f64-832a-6ba9cc706639/xurafitodojabapan.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/her_smell_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95bd539e-f87f-4a40-8314-2cc05d087bf4/get_burn_permit_tennessee.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/vewek.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/azure_key_vault_arm_template_access_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/laal_chunariya_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6191d74-7234-4fff-8745-01ec8dcb28c2/desavufidutepenaweduza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215c9e4d-b4e1-4ecb-a08a-9a5523cd6c74/10282604405.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/68872727579.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55652239b0722914ec2bc/t/5fc656e45147b148040af1b1/1606833893014/planet_earth_3d_map.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 5148 bytes
SHA-256: 9f94542c7523ce6275507150b967a8cbd316f72ac39300f15e9858afabd01645
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10812 bytes
SHA-256: aa331c0790f837aa8ce72107098f6efbdd863b9dca00444ee531186eb2c3ddc4

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