Malicious PDF — malware analysis report

Static analysis result for SHA-256 2662735cbacfc3ed…

MALICIOUS

PDF

100.8 KB Created: 2021-01-12 01:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 60584fdc992d85bc8cc9b110783f7a16 SHA-1: cd949b2a099982a42fdab57ff648d663e459674a SHA-256: 2662735cbacfc3ed2bb4a477b712c5915a13dc29550b223b6f582a2e2b429001
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and dates, but the primary malicious activity appears to be the redirection to external URLs for potential exploitation or credential harvesting.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=original+six+nhl+teams+list PDF link annotation
    • https://site-1172512.mozfiles.com/files/1172512/26242459126.pdfIn PDF document text
    • https://site-1168481.mozfiles.com/files/1168481/gorikadetomovaxez.pdfIn PDF document text
    • https://fuvimufuba.weebly.com/uploads/1/3/4/8/134870364/nibom-tefanonazow.pdfIn PDF document text
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/f9dfe59423.pdfIn PDF document text
    • https://site-1178369.mozfiles.com/files/1178369/how_to_lift_twitter_search_ban.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/lathe_machine_accident_russia.pdfIn PDF document text
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/7121589.pdfIn PDF document text
    • https://site-1181037.mozfiles.com/files/1181037/viridiana_name_popularity.pdfIn PDF document text
    • https://site-1176903.mozfiles.com/files/1176903/59181419421.pdfIn PDF document text
    • https://site-1184900.mozfiles.com/files/1184900/78202215929.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/kief9jj/fimefelivo.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/bupidewatopenir.pdfIn PDF document text
    • https://site-1236126.mozfiles.com/files/1236126/generic_fax_cover_sheet_confidential.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/Gijjjpu/86622817966.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/027e6a02539d6.pdfIn PDF document text
    • https://site-1174729.mozfiles.com/files/1174729/49288231485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zupenafud/blackstone_griddle_clearance_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408C 4872 bytes
SHA-256: 70c54220b2ca50e145495523331c319cd30ce05c18ab74bc92d2719d268f7397
font_01_sfnt_off000150e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E3 11676 bytes
SHA-256: dec87b562ef0ddee4dd6fb6fee84d38e49af88b6f44025b0fcfe0f7cfc189bdf
font_02_sfnt_off00017769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17769 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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