Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc98e0a012ee34…

MALICIOUS

PDF

70.5 KB Created: 2021-01-19 10:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 751bda0e53388ed27d736cd6c9358bcb SHA-1: 3f7bdb204fc1a918e57c2a701eb691b0bbfa99de SHA-256: 55bc98e0a012ee34991a80469392b69b5a3256613b5039fa68b10033a589d07f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, with one specifically pointing to 'trafffi.ru', suggesting it functions as a lure to redirect users to potentially malicious websites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

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=comfort+heating+and+air+sanford+nc PDF link annotation
    • https://cdn.sqhk.co/suwapipejob/dgCihUI/aafes_military_clothing_sales_fort_hood_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/51icDie/rifufinofoger.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/jaidYhd/4038756579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5feba1f7a78c0.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_5ffe6b8b005f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5fdfce36b357d.pdfIn PDF document text
    • https://site-1226241.mozfiles.com/files/1226241/61090305820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcb2883353fa.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/fexupakezopoter.pdfIn PDF document text
    • https://site-1223295.mozfiles.com/files/1223295/zig_zag_pattern_in_vision.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f9baebb28ec4.pdfIn PDF document text
    • https://site-1174141.mozfiles.com/files/1174141/ksr_kingswood_smash_repairs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/febugawasigegabaxujiwed.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/27412211326.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 5308 bytes
SHA-256: f7c44e4471f690441cdc2c17037191a45e445cdde7d582b88f986fb11927da57
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 11264 bytes
SHA-256: 736d7aee864856fa4cf8e7823a3a0ec3ada408e33692a16796dcc0e4b3340c9a

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