Malicious PDF — malware analysis report

Static analysis result for SHA-256 351776c4cdaf128e…

MALICIOUS

PDF

70.0 KB Created: 2020-12-25 21:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7293d72d2fdf328e15d03a44afa887 SHA-1: e3f8596c5ea1b21a677f5e81dfb81cfee32092b7 SHA-256: 351776c4cdaf128e42eb100efd280b323c8e22e28906570c6b5b071a33e0734b
184 Risk Score

Malware Insights

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

The PDF document contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'school learning apps', which is often used in phishing campaigns. The presence of multiple unknown URLs hosted on disposable domains further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=school+learning+apps
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/6799821.pdf
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/2958848.pdf
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/votugozumigixab_notit.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/tosede.pdf
    • https://koxalisibigemig.weebly.com/uploads/1/3/4/8/134854932/3492350.pdf
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/bewanototaful.pdf
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/584176.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/c2bbd4cc16b88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zesotat/tactical_intervention_game.pdf
    • https://s3.amazonaws.com/lupebesu/95906384253.pdf
    • https://s3.amazonaws.com/mipizaju/cardboard_sheets_48_x_96.pdf
    • https://s3.amazonaws.com/lazolu/49424198201.pdf
    • https://s3.amazonaws.com/roxawo/blank_warranty_deed_form_missouri.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_off0000d70a.bin
f81c7a015982d41e547bbfe364097ba95dcbe78b7cdf93a9d35476eb5e2c5d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 5300 bytes
font_01_sfnt_off0000e906.bin
bb2d3f51ab64b988fd5c4669429ef6eb26618502b7270759f2e9568bf84ddfa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10280 bytes

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