Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a032e3c7c95b1a…

MALICIOUS

PDF

77.2 KB Created: 2021-04-10 13:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4775ef52b7a1b68aeff636586d3122 SHA-1: 2fa9840f5fff30ef67168d2e175b01b45e3d5759 SHA-256: 34a032e3c7c95b1a8db64f4227c10e929dc00fe528090ceb0b63e6c45fd70865
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF acts as a link farm to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+to+use+black+and+decker+rice+cooker+and+steamer
    • http://vbnmcxz.xyz/how_to_win_capsim_round_1zkcnr.pdf
    • http://salea.site/xelamedakujijasagim45n3.pdf
    • http://homebig.space/how_do_you_know_the_end_behavior_of_a_polynomial_functioncvs2u.pdf
    • http://winoorama.fun/asmaul_husna_adalah_nama-nama_baik_dan_agung_bagitarr3.pdf
    • http://labiosdewonda.com/29922824718xnh0h.pdf
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/wikomumexexoxov-bisulufu-guravitide.pdf
    • http://avtoshkola-region26.ru/minecraft_1._14._4_crafting_guide6adl6.pdf
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/5384315.pdf
    • http://zvezdasevera.online/free_reading_comprehension_worksheets_for_fourth_gradersqh6ul.pdf
    • http://simkosa.website/canon_mx300_printer_paper_jam_errorr9b73.pdf
    • http://unreguezff.rest/past_simple_and_present_continuous_exercisebn4rh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a981e62-2f0c-4925-a559-30ad12e56b86/43731651857.pdf
    • http://bisumige.epizy.com/zivusivuboluranixuwoseni.pdf
    • http://koxunum.epizy.com/how_to_markup_on_ipad.pdf
    • http://rejinivak.rf.gd/42030068994.pdf
    • http://toxuwer.epizy.com/biconditional_and_definitions_2-_3_answers.pdf
    • https://uploads.strikinglycdn.com/files/2c6d4daa-293c-4d8a-9e9e-f495030f0a63/56979475238.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5e.bin
e4060e5d7bc3b202f8f5df29b6949457ce47036a360d3f5c5a96e34670e26b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5344 bytes
font_01_sfnt_off0001017c.bin
6fa2f0a77374e6e85cc94da12f2707b0dd90bab264b5d7f125c7328b9bf9aeae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11060 bytes

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