Malicious PDF — malware analysis report

Static analysis result for SHA-256 091a3a71714b0ac9…

MALICIOUS

PDF

133.4 KB Created: 2021-04-13 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 78baa586ba55ccb760c9dcd1b601ee27 SHA-1: 7ef62940e1d8cdf4286816072f291f5b69d80c0e SHA-256: 091a3a71714b0ac92e1fe122810d4059f01e31e359496a2c2158942bfdbf9bce
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, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=harley+davidson+service+schedule PDF link annotation
    • https://cdn.sqhk.co/moxawitab/gh5iaso/seeds_for_minecraft_pe_jungle.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/ididbjL/snake_and_ladder_board_game_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_6025f6009bf02.pdfIn PDF document text
    • http://gajuduxotam.iblogger.org/jejaloxibabewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_604b04859dc07.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/af5b1880d.pdfIn PDF document text
    • http://govazibibili.22web.org/rumeduvido.pdfIn PDF document text
    • https://cdn.sqhk.co/nixuzosa/Yjanhhk/4669834018.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/6751795.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jA2t6NC/nolamilorejeriz.pdfIn PDF document text
    • https://cdn.sqhk.co/ranamifujuki/jUhfje1/road_traffic_collision_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ggjbkia/44213402822.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/fSjigfz/movies_to_watch_with_friends_on_disney_plus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_603ef8911da7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d14eab8-cd9b-46f3-9672-e3282ba63f7f/xuwelixamosaxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8da796e-af3f-4500-8f9d-cf06f9b8d0a6/what_penny_stocks_to_buy_today_on_robinhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3c023c-5593-439a-a8e5-c4397914ab86/tivewodixubovuwetab.pdfIn PDF document text
    • http://julexobe.rf.gd/80717086343.pdfIn PDF document text
    • http://vuwadiwotaja.rf.gd/siduzojirini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24375db-3b02-419b-88e8-5510f15faff8/18175317263.pdfIn PDF document text
    • http://dovibero.rf.gd/vasig.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_off0001d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F6 5148 bytes
SHA-256: 7e76847df9cf49fd12eb81938ef07011fdb4e0edcd9b030aa8f60643c0af5f24
font_01_sfnt_off0001e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E27C 10896 bytes
SHA-256: ca5168265a1d49716e2f6bf77263acd7d4a12abd5a32dfb39f2ede31b4979f2f