Malicious PDF — malware analysis report

Static analysis result for SHA-256 7525d5834eadd6c5…

MALICIOUS

PDF

79.0 KB Created: 2021-02-18 22:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 137598ca6145f1bcee9fb1262e4eb66e SHA-1: 6ecb62305d6419e86bf2201958c001e4abf26544 SHA-256: 7525d5834eadd6c540faf3fc6da63e34fb3da482f3a19ad165736e93a0c4bc4c
186 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 by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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/123?utm_term=ratios+and+proportions+worksheet+pdf+with+answers PDF link annotation
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/3c38473a.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/iZhdwib/weekend_update_snl_full.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/1628913.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/9678969.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/ahfv2Bv/sunuli.pdfIn PDF document text
    • http://help-bluebadgecenter.com/gagixurobalatxp.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/Yibje6S/top_scorers_in_nba_history_list.pdfIn PDF document text
    • http://bupro.asia/63668243044xj6gq.pdfIn PDF document text
    • http://zahlungsservice-ch.site/84515628982163mm.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/pnlhchi/minecraft_story_mode_game_apk.pdfIn PDF document text
    • http://bluhgang.best/72988019461yonlm.pdfIn PDF document text
    • http://copyrightshelpcenter.com/lixuvotowowudomaloginx0x63.pdfIn PDF document text
    • https://tababara.weebly.com/uploads/1/3/0/7/130739165/09e2b09.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/8932294.pdfIn PDF document text
    • http://natural-shop.info/how_to_alleviate_lower_back_pain_while_pregnanty7ger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firuwasuwubo.epizy.com/wugiwogidaz.pdfIn PDF document text
    • http://diruxepuf.epizy.com/formal_diagnostic_assessment.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 5260 bytes
SHA-256: 7b003b6780fa2bbf3d71bb0186b5961392ca34d6adfe8fdcc48e975f72ea35a5
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 11492 bytes
SHA-256: c5573ae08dfb7df3618b356e2474e92a222d92fc885b49d8f8e8a145d89e0237
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16528 bytes
SHA-256: f1b98a7f260200cf9593bd85ad3ad31878bf5a901a58f251a12caedba9b0191c

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