Malicious PDF — malware analysis report

Static analysis result for SHA-256 76186df1cecd3b15…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 18:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c4bb8286705a09c35ab89fd1939bfb6 SHA-1: 05f6ce5a005a71eefd69db3fadb899cbd057643b SHA-256: 76186df1cecd3b1585900fddbb09fa65589e10011e9673061b7bed2d2fbce52d
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to potentially malicious content or phishing sites. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=badger+vs+wolverine+football PDF link annotation
    • http://legiontry.online/all_souls_day_2020_tucson_az3fhkt.pdfIn PDF document text
    • http://praktika-ingenieur.com/toguliwelodakibog2hws2.pdfIn PDF document text
    • http://freefire-gifts.com/taptap_app_review4ry1v.pdfIn PDF document text
    • http://zahlungsservice-ch.site/physics_solutions_class_11kyrsp.pdfIn PDF document text
    • http://salopkisa.website/how_to_change_needle_on_brother_lock_1034d5v2gt.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/d182888e.pdfIn PDF document text
    • http://reduslim-shop.website/black_market_android_apktb4ls.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/zisevugakegepokad.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/2605337b.pdfIn PDF document text
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/52980.pdfIn PDF document text
    • http://mosdendy.store/pezuvutarakisegulutigafotohxys.pdfIn PDF document text
    • http://bluebadgeapproval.com/talunuzedagugifaret8nn1l.pdfIn PDF document text
    • http://stav-games.ru/59814877866385x4.pdfIn PDF document text
    • http://legalvictory.group/66279465942twivm.pdfIn PDF document text
    • https://bexalasavego.weebly.com/uploads/1/3/4/6/134650617/kidexiv-xupigekixipep-nonadasenawe-gabesobu.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/2688850.pdfIn PDF document text
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/30258.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/6705308.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/jodebexumawamirufeku.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/nagubokar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_5307fc6afb6648228d331eee755b3317.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_739ad672063d41a48b6e1767524b3ee2.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_b6ea337b031e4a8ca78738aaf43df8ba.pdf?index=trueIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_a2b854a8ac50449aa537c980d28044ce.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_799999b1aed944458ad7246cdc1abe5d.pdf?index=trueIn 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5416 bytes
SHA-256: 796fe148c92d9d9e7ccd8f009434ee1695cb751f951d4f2e4557cbc532697304
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11124 bytes
SHA-256: dd17716f06ea85ec9b9580c7ae8cbb9d188373e82144c096e0c78bf5c38455ac