Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91dbb605224567d…

MALICIOUS

PDF

63.7 KB Created: 2020-12-20 19:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe9a468e562bf7f743d967986d4d78e SHA-1: 5e3afd2a3652057b7503572e760d67408fea5f4c SHA-256: d91dbb605224567da371a2fba1fcdd4a6e0ce5daff53a6b6fa9eed09d3229ee8
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 point to other PDF files, indicating a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://traffking.ru/123?utm_term=words+that+start+with+exi', is directly embedded in the document's metadata and is flagged as suspicious. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://traffking.ru/123?utm_term=words+that+start+with+exi
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/9ae7fd101cc.pdf
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/pejika.pdf
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/xiwunifedu_vevuxurajuda_tixuvetorun.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/nojuxolor-juwenekosif-dizekiki-nupisasiva.pdf
    • https://gabatilijoden.weebly.com/uploads/1/3/4/7/134730515/mitegepulid.pdf
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/11e28a7e.pdf
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/5371818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jezekemunidup/sponsorship_approval_letter_template.pdf
    • https://uploads.strikinglycdn.com/files/7c7087a6-ca12-4bf9-bfb5-0fc6eae5e023/84330472908.pdf
    • https://uploads.strikinglycdn.com/files/6c674304-5929-44e6-9d1a-5b4da2344adf/retofiromopokoturu.pdf
    • https://s3.amazonaws.com/teximikamukubo/classification_of_bakery_products.pdf
    • https://s3.amazonaws.com/piradi/76649978221.pdf
    • https://s3.amazonaws.com/vuzufexarevima/ak_47_gun_photo.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_off0000afc4.bin
c6008823c1e4fecf4c4d5a6db3a81008b9ccd8f017ff922f1b8acb5985ebb391
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 4736 bytes
font_01_sfnt_off0000c00c.bin
4f54f508fb3e9629f9cad814aa606aafe321fd61a3616e6b3bcc7ac0369aea50
pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 10440 bytes
font_02_sfnt_off0000e3c9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 4324 bytes