Malicious PDF — malware analysis report

Static analysis result for SHA-256 c688d8b0a2204c74…

MALICIOUS

PDF

69.2 KB Created: 2020-12-04 05:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6521e516fea626e827742f2afeee8e8d SHA-1: d41fd400bdd7948032205ae6e34eead97c96a3bb SHA-256: c688d8b0a2204c7433ef5f7fa3a75362b822943b3f41862f00f264a0a02222dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to seemingly benign PDFs, but one primary malicious URL, 'https://trafffi.ru/strik?utm_term=mozart+and+the+whale', is present. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings suggest a link farm or SEO spam tactic to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffi.ru/strik?utm_term=mozart+and+the+whale PDF link annotation
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/f000ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5e31e18c5c478ef386c0/1606377021227/sitapu.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/bose_colorlink_bluetooth_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/balajinabari.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/black_s_law_dictionary_fifth_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf2d3cb3e0f577113ce26/1606283998103/mekejizaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbd9dd2-7d39-4d49-8d61-26f331a8b1aa/zombie_frontier_3_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/fekujitatex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6256d6a4-8f93-4b9a-970d-9762925eb1c8/85125308669.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf24feaf37e3b646102ac/1606283858276/75758959440.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53be9ee0f32b874a80d3/1606374335378/husky_lab_mix_puppies_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/36550656665.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 4880 bytes
SHA-256: d18d71d2b8a02272794557d05252f82ed36fd001fe65409d38bf4a6e69038a6a
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10456 bytes
SHA-256: 98f7d2ce53c4c8a95deb40edc7add92da7f38517181adcf55173029ee9a148af

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