Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49446dd6f0b0208…

MALICIOUS

PDF

70.9 KB Created: 2020-12-18 03:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ee95321710e3f4cbf68fb951ca0123 SHA-1: 4c1d3a5b39c5dad536961e589715b815474714b2 SHA-256: b49446dd6f0b0208e52e39683da08a9ddb7b97f13e4b34d53a026d3b9390c8e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=shigley%2527s+mechanical+engineering+design+solutions+manual+si+units
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/4a0b2.pdf
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/nazik-retekoxonige-sazobamiboda-bamotuwol.pdf
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/lidimonegowuwafumi.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/pejul_dujuvejup_fakabinarulato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fisulefajow/free_browser_recommended.pdf
    • https://s3.amazonaws.com/senodiw/guideposts_prayer_companion.pdf
    • https://uploads.strikinglycdn.com/files/0696fcd0-d300-4660-95c2-ab90ca54b58f/15670818700.pdf
    • https://s3.amazonaws.com/xozeb/classic_bulldozer_game_free_for_pc.pdf
    • https://s3.amazonaws.com/bezegoluzose/middle_school_tech_ed_projects.pdf
    • https://s3.amazonaws.com/nufidibodudulad/english_b1_book.pdf
    • https://s3.amazonaws.com/joterige/whatsapp_animated_gif_images.pdf
    • https://s3.amazonaws.com/widuxade/43034950095.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/51177561614.pdf
    • https://s3.amazonaws.com/rekibedafowow/wwe_champions_hack.pdf
    • https://s3.amazonaws.com/bejideba/gomukudapo.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_off0000cd83.bin
72878aa474cf7fb4ac539a3ee4469c3d0c790bb8d62ec62df27a15575f92c268
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 5592 bytes
font_01_sfnt_off0000e06d.bin
38748bdef7dffd80e48ba93a3124547a5962b9303c23ea0016db792603f3de99
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 12724 bytes