Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf7399c532c4e0d…

MALICIOUS

PDF

86.0 KB Created: 2020-11-16 22:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a0dccb245fbe58bd3f6cb5cd839a646 SHA-1: d3c0ef81d05391fe92916e5ae2b39f6083d10e56 SHA-256: baf7399c532c4e0deb7827d3a16b964af1748f56573849ed5609d4cb563c5c93
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 24 links, suggesting a large-scale attempt to direct users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the document's structure point towards a phishing or malware distribution campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=mgm+dvd+store
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/7374642.pdf
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/7687388.pdf
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/8962696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxepiduded/34320436787.pdf
    • https://uploads.strikinglycdn.com/files/a9ef96ce-757c-4e94-8317-3dd4fba873a4/grid_enlargement_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/a8a90ed5-c094-4094-967c-971244db5110/22810279973.pdf
    • https://uploads.strikinglycdn.com/files/06e410f2-8a0b-4198-9893-2cd006c55fe3/prophetic_training.pdf
    • https://s3.amazonaws.com/vasofirida/manil.pdf
    • https://s3.amazonaws.com/pazerogasarinu/bisanolapukajalugigujax.pdf
    • https://uploads.strikinglycdn.com/files/eb29cc57-b1dd-4e89-853c-3d38e87bd5b8/sigobotesukazomoso.pdf
    • https://uploads.strikinglycdn.com/files/2b3ba58b-09a1-4159-8335-e79f06cb2875/7223230048.pdf
    • https://uploads.strikinglycdn.com/files/a86e50a7-0aa0-4c08-bf82-b08e4c613ad9/bowuvufusanomaf.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_off0001142e.bin
5687753fa82a8ccb3e5c0e1b0106f569bdce197325aab357660112c6350cd2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 4968 bytes
font_01_sfnt_off00012517.bin
ab8f702bdc31c576fed3963ac3177a2f841c9e28956c3d9965ce591cc3d29afd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 11436 bytes