Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1af92bb9bd177e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-12 00:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 026b53c4701c3bd0672398d0ebce2bf6 SHA-1: eeffddefe3919ab6f93bfa5053d60f9c9da3599f SHA-256: 7f1af92bb9bd177ec467bb857a441c12037f75681426f1a18de21faf52d7b032
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which lead to disposable hosting or unknown domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=oliguria+significado+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd2c71be087a.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/the_darkest_minds_never_fade_movie_trailer.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/22748190562.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/digital_storage_oscilloscope_block_diagram.pdfIn PDF document text
    • http://malurafokopumer.22web.org/30314627705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_604836dbcc8be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasaxotudulolo.epizy.com/buffalo_bills_rumors_bleacher_report.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_cb1d0e525a4c4f01b747e45241170b37.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_52d54fcf637747a084c0843dfa252fd1.pdf?index=trueIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/how_to_quit_smoking_book_by_allen_carr.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_ced4547b5f784bf382d29625cda4a2e3.pdf?index=trueIn PDF document text
    • http://gumupomomoripu.rf.gd/kegexojexuzogizuxulajib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a74b2fa-9a2f-47f2-acac-3d3fd3390a12/levenunalefutizeta.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_3cd5860ee3014d1f800293ed1d0c1856.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_dfd9149664b4431081644694abbdbba5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddec422e-7d14-4d1a-8f4d-fc3085e98008/35060368745.pdfIn PDF document text
    • http://tamakibegotilo.epizy.com/rimolelenajiranitabol.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/gevul.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_0b34e789ddbc441bb13ede35e1b1938c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc26f6ec-6586-439f-9c96-4a1c15d98133/40011425936.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_69e00a00298645fbac37dba43d5a0233.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5348 bytes
SHA-256: 876b1c2bb626606f5f0327d905801fd6154990fbb809695c8b5be186fec4b4cf
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 10892 bytes
SHA-256: d28ea90b24005aa70173d438daf40afd5b7d2ac3062ad6c650e2752ce3c8bed2

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