Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d1b90528b79cc1…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 04:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b35472b540ce48fada8c9107ad71f711 SHA-1: 5110edfc30208a646ee9685669b834065b7b2759 SHA-256: a5d1b90528b79cc11c0b0402c8720a8fa73a28145e5b4640e838499bd559064f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, with the embedded URLs likely serving as phishing lures or downloaders for further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/aws?utm_term=choke+chuck+palahniuk+book PDF link annotation
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/9465292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fecc6b110516.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/b0sINhe/vomigug.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/Z3ghKhi/87199295642.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/2gjibgc/white_lemuroid_ringtail_possum_climate_change.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/5386984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_601b1af638d24.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/fLrjbhh/pocahontas_colors_of_the_wind_lyrics_tori_kelly.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/jjhidRp/pong_video_game_world_championship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5fe1a60189026.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/02eaed290adf77.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/bKighjV/playstation_4_controller_black_friday.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5fc6b13bc5c9d.pdfIn PDF document text
    • http://sesopuligu.iblogger.org/avatar_creator_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_5fe655f430de2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifofok.epizy.com/altars_in_the_bible.pdfIn PDF document text
    • http://wufiwujexuwinaw.epizy.com/fepunubetobaxibilugoz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 4856 bytes
SHA-256: 6b52f7556cd19ee5dc4b8a6a52984e43f3a11ed207e9a4fdec221553dfc19b94
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10632 bytes
SHA-256: 35f5c0ef3b872ac1207f90f1ec482934aaa8614800e0650ba84f19488330d5e1

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