Malicious PDF — malware analysis report

Static analysis result for SHA-256 951d5ef04636b4d5…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 16:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a95c279c4a9254226b1b9613d31f9e39 SHA-1: 88da4d4c090326302aecd537c3bf11f2787c3e1d SHA-256: 951d5ef04636b4d5f77a3590e06c843e7b6258e686053e4394d4fbf324f306dc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The presence of multiple URLs, including one pointing to 'druttle.ru', and a ClamAV detection of 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/123?utm_term=annie+khalid+mahiya+video+song
    • https://cdn-cms.f-static.net/uploads/4481841/normal_60336ebfe7221.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_601e5a6d18a9f.pdf
    • https://cdn-cms.f-static.net/uploads/4418175/normal_60126b6036a14.pdf
    • https://cdn-cms.f-static.net/uploads/4393181/normal_6012963922436.pdf
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5ffa02431bb7a.pdf
    • https://cdn.sqhk.co/dewufidabo/hfgjicy/sunolizaxegapazugolagala.pdf
    • https://cdn.sqhk.co/jujifefa/jjfwjba/meal_planning_worksheet_printable.pdf
    • https://cdn.sqhk.co/puwidebudojo/epU0C6d/scary_teacher_3d_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4427506/normal_602a35a377456.pdf
    • https://cdn.sqhk.co/jagapifa/hejjehh/cleaning_checklist_printable_template.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd663ad01a7e.pdf
    • https://gejamuxubidiz.weebly.com/uploads/1/3/4/6/134688077/rivujirugadadef.pdf
    • http://adanakebap.org/300821604908dlq.pdf
    • http://vseti.life/40762085894rga90.pdf
    • https://cdn.sqhk.co/desavusomo/s7EC1gc/redcon1_mre_bar_blueberry_cobbler.pdf
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/5031097.pdf
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5fcb1b276bacd.pdf
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5fe9e5539f326.pdf
    • https://cdn.sqhk.co/zirizowesaw/gfhgghf/rewards_reading_program_dyslexia.pdf
    • https://cdn.sqhk.co/wotutovebo/jdLgJ8x/hollywood_reporter_cinematographers_roundtable_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fff613d4eee0.pdf
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/1690823.pdf
    • https://cdn.sqhk.co/sunidoxil/Z7Kiahg/87808093756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f26c.bin
861a108a64a09e4c214dcc2cbd5d0463683f4c775eb5bee0c7d6603a469da3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5360 bytes
font_01_sfnt_off00010492.bin
5d6c527e9102a0671124b61bf56fcb7573ce514eca9d2d44bea7fed6b8b8bc8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10536 bytes

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