Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d741cffc0d9668…

MALICIOUS

PDF

116.3 KB Created: 2021-04-15 01:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1ca2ee4961df56636ca952608bed177a SHA-1: 2be261a3f9fa5ff4f597f7b14ea4f570e62a70df SHA-256: b1d741cffc0d96684231fc0f589256dec3525d8291a8b9bedf47f18fa2e48637
166 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains multiple links to external domains, including one flagged as a link farm on disposable hosting, and another that is algorithmically generated. The document body is heavily obfuscated and appears to be a lure, possibly related to search engine optimization or content aggregation, to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fokemale.ru/strik?utm_term=theory+of+justice+john+rawls+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5fec261d47154.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/jbidaub/3585076837.pdfIn PDF document text
    • http://1-bog.ru/vanulagixujigeelm63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_6026ebd77f31a.pdfIn PDF document text
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/vifovilopufutesan.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/menemurirujiwe.pdfIn PDF document text
    • http://gatorama.fun/juxinexitajugujavomivodinexorz.pdfIn PDF document text
    • https://fufifodex.weebly.com/uploads/1/3/2/8/132814348/pobix-dovixogof-sapebezagiguran-dizexupuxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/acYHQnA/28764291641.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/86598767444.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/how_to_figure_out_a_redox_reactionzkd9i.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/split_mac_terminal.pdfIn PDF document text
    • http://silkhfig.bid/d-link_dcs-932l_softwarep1ypr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazemopu.rf.gd/zisekipitekojoligufu.pdfIn PDF document text
    • http://wudobepazu.rf.gd/cable_and_deadpool_comic.pdfIn PDF document text
    • http://datadeb.epizy.com/beneficios_del_aceite_de_oliva_extra_virgen.pdfIn PDF document text
    • http://xufivutuxalug.rf.gd/naseta.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_off000188e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E0 5340 bytes
SHA-256: 9b73c557aaad95e2d460bc5bee5e9e87c9938978fea1224080b273081daf1e73
font_01_sfnt_off00019b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B01 11872 bytes
SHA-256: ad385dd270ad8430fd112c687f6d23b6480373adc6976c1dfa75b94200302b6c

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