Malicious PDF — malware analysis report

Static analysis result for SHA-256 286cbdebca8275d2…

MALICIOUS

PDF

81.3 KB Created: 2021-01-14 01:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22c7246c776e244606a12abec568357 SHA-1: efd989a4c63a021e840b386de068d95510cbdd09 SHA-256: 286cbdebca8275d2b1dfcf6f3bfb4efbd9f83eef2c5c9d808dde140390710ec3
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a billing or renewal context. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious sites or initiate fraudulent communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=tlc+renew+license
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/93c8420a430.pdf
    • https://site-1180269.mozfiles.com/files/1180269/just_drift_it_pc_game.pdf
    • https://site-1175916.mozfiles.com/files/1175916/nemoguwina.pdf
    • https://cdn.sqhk.co/bovokolel/jNgfAtW/94441540183.pdf
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/4585417.pdf
    • https://site-1166084.mozfiles.com/files/1166084/fidic_contract_2020.pdf
    • https://site-1083772.mozfiles.com/files/1083772/pacific_energy_fireplace_insert_manual.pdf
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/09728.pdf
    • https://site-1177660.mozfiles.com/files/1177660/rusajimenurewoxo.pdf
    • https://site-1168401.mozfiles.com/files/1168401/ringtone_guitar_malayalam_film_songs.pdf
    • https://cdn.sqhk.co/gudopokobipa/gfihHaQ/let_s_hit_it_off_meaning.pdf
    • https://mynytaxi.com//www.nyc.gov/lars/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonabafat/pafatadifoxevofilusevixi.pdf
    • https://s3.amazonaws.com/gujutavevive/rijokunesanipesuje.pdf
    • https://s3.amazonaws.com/naxizugenabi/animated_gif_wallpapers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3c.bin
ce65eeb8fa1dae858406b2e328e498201fe4d1aad4803f621aa373240a8aef3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 4624 bytes
font_01_sfnt_off0000fc19.bin
029bd8272edcc64fe8201bdfbce327f607d09169a8ab18cfc9dca2903c4ba2ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 11508 bytes
font_02_sfnt_off00012368.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 16060 bytes

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