Malicious PDF — malware analysis report

Static analysis result for SHA-256 3339a7a0348c1ded…

MALICIOUS

PDF

75.3 KB Created: 2021-01-18 15:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f60c46dc3f41d8782358815a86235b SHA-1: e7051b3b8dd9b0c1b188aef8bac9692c977fdf7d SHA-256: 3339a7a0348c1ded480bb6c97e4cbd9149ae0d0398805822b76125e228b5f839
156 Risk Score

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 phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to product reviews, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=nitto+trail+grappler+g2+reviews
    • http://bogaxusamukuxid.22web.org/2668156848.pdf
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/2059139.pdf
    • https://niparazuxadema.weebly.com/uploads/1/3/4/0/134040736/3af8d.pdf
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/nisipuboxago-lopen-zofawe.pdf
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/e8623fd06ea3de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jatomije.rf.gd/all_badman_binladin_songs.pdf
    • https://s3.amazonaws.com/wixamupelinere/adlani_rambe_seberkas_sinar_mp4.pdf
    • http://magotabitujotu.rf.gd/bone_marrow_transplantation_journal.pdf
    • https://s3.amazonaws.com/jebokizez/life_cycle_of_a_butterfly_lesson_plan.pdf
    • https://s3.amazonaws.com/zafijukopa/birdland_paradise_hack_apk.pdf
    • https://s3.amazonaws.com/divikufifir/dagamobo.pdf
    • https://s3.amazonaws.com/nupotukig/approximation_for_sbi_po.pdf
    • https://s3.amazonaws.com/pazatuv/candidemia_guidelines_2015.pdf
    • https://s3.amazonaws.com/jifedefujodu/51185703716.pdf
    • https://s3.amazonaws.com/dobikasukavu/walmart_financial_report_2009.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_off0000e652.bin
6680170bb166af062581677a0ed5ab6adaddc9564d81a7146add922ceeaf93aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 5240 bytes
font_01_sfnt_off0000f84c.bin
4219f07a9fae93196cc4a5f9332b3d74694e3d9e4c5b42b6fd14b7452dfca600
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 11156 bytes