Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cb899015d4e4fc…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 16:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5565f1da1d4512e5ce46e38a21c979b1 SHA-1: 3156586256f3321c5f5fd9fcec48bd618b937fb3 SHA-256: b8cb899015d4e4fc7bdd22a78713c13888c93370db9f9e5460ccfd3346edc3a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=if+not+equal+android+studio
    • http://devicesprotectionforusers.site/54620920473zvt1t.pdf
    • http://tiktokfrance.fun/26649018760q94b4.pdf
    • http://madusotiju.22web.org/8842006168.pdf
    • http://bexodasavuf.22web.org/3247972687.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mibenovelu.epizy.com/28347897855.pdf
    • http://dejunividote.rf.gd/suxeduralan.pdf
    • https://uploads.strikinglycdn.com/files/3f8e02cb-ccfa-4668-a184-b35f184656d5/yamaha_yas-203_soundbar_with_wireless_subwoofer.pdf
    • https://s3.amazonaws.com/debiwelof/ikea_kitchen_guide_uk.pdf
    • http://ligubulativov.epizy.com/89699178129.pdf
    • https://uploads.strikinglycdn.com/files/334cdd90-a712-4b79-b61b-207a8998cefb/38163920620.pdf
    • http://vezuzatutuxi.epizy.com/how_do_i_make_flying_lanterns.pdf
    • http://batunat.epizy.com/wumelawaxifodavozixazobut.pdf
    • http://mebupeb.rf.gd/41234521689.pdf
    • http://daponub.epizy.com/80933069152.pdf
    • https://uploads.strikinglycdn.com/files/fcdff6ac-5eaf-4ae4-acfa-1455ec127ce6/64891788417.pdf
    • https://uploads.strikinglycdn.com/files/9784bb2e-a80f-413d-be1c-7e91eb0e35c8/wolarefiluf.pdf
    • https://s3.amazonaws.com/dorulusof/tatala.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_off0000f048.bin
3251539b6946d132733e2e7ae2bd1678e7c4dc1c4099e196725d163f95b4684b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 4964 bytes
font_01_sfnt_off00010137.bin
33347c5b54dd3c9c572ed48c7120b70797acd6625a4519a6330efee11d276de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 11612 bytes

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