Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d9a29ff578a6d3…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 04:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5766ebecb685695397f0a07156fc440a SHA-1: 0ee706ceb3c9207f5893441549e8d9b8c1f59494 SHA-256: 91d9a29ff578a6d398b4eebbf28784b078debb5cbc0cb4107527f733f8285cb8
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=time+management+schedule+template+for+students PDF link annotation
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/ramuju-fuvaso-sujew-vasig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_602fb3569be4e.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/sierra_.308_165_gr_gameking_sbt_load_data.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/93693473008.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/bjeyhe1/bottle_shooting_game_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ihgj6hc/49691700878.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/35e8711bf7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/g9AFjFv/648974626.pdfIn PDF document text
    • http://zirekafeti.iblogger.org/16474978969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5fde1119c4dcd.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/WjdmAgR/civil_case_short_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_6059418c701e0.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/direv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaduxovogemuke.epizy.com/piledorerebuk.pdfIn PDF document text
    • http://detapir.rf.gd/32297936525.pdfIn PDF document text
    • http://muzasedek.epizy.com/algebra_1_textbook_free.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/bostitch_6_gal_air_compressor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/sukikabonebetew.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/icao_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/giparibuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/88500450444.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/51842426853.pdfIn PDF document text
    • http://motuvogipe.onlinewebshop.net/carcinoma_seroso_papilar_de_ovario.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/conditional_2_exercises_with_answers.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 5516 bytes
SHA-256: f66fcb357dd5c1941133eb5e7573df275ab88cec5b15bfd3007e24798d3c725b
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10532 bytes
SHA-256: 056bae4b05d780db175aab0cfc8f9ceb0c89d35e0c556216e8216d7202e8fee0

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