Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0f8d91dfb01767…

MALICIOUS

PDF

81.2 KB Created: 2021-05-18 03:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e5150ddd4008eafc45ccea384e6f7504 SHA-1: e288ffe1f65d20ab78790960b6ccaf431f98279c SHA-256: 0c0f8d91dfb01767f8ecdb863f129c824cd7f72c3259f8d9ae61ffab93c47a40
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external websites, masquerading as legitimate documents. The primary malicious URL identified is jumiwimov.ru, which appears to be part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jumiwimov.ru/strik?utm_term=math+word+problems+with+answers+and+solutions+pdf PDF link annotation
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/39c1033.pdfIn PDF document text
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/sered_lalovo.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/618200.pdfIn PDF document text
    • http://gemajesubon.22web.org/cutting_tools_geometry.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/cc14b.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/vazedokodasibe-rovuvux.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/c740d4089.pdfIn PDF document text
    • http://gujinir.22web.org/revinomanij.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/fc90f674-3a22-4415-b4fe-b9270d49f3d4/xizowozibumawopuxo.pdfIn PDF document text
    • http://sawokinajiralar.rf.gd/92192299410.pdfIn PDF document text
    • http://pimibini.epizy.com/doing_better_than_ever_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b688e082-fd74-4b10-8a0f-adb36e3b0ed8/toad_for_mysql_mac_free_download.pdfIn PDF document text
    • http://semewovutiwo.rf.gd/hp_officejet_4500_print_cartridge_problem_tri-color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90495d2-6c2f-46ca-af4f-a0cf6715b986/how_to_adjust_temperature_on_rv_water_heater.pdfIn PDF document text
    • http://xatesowogexiwu.epizy.com/lithium_ion_battery_nptel.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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 5516 bytes
SHA-256: 7b482cf208f58f75ee865072ea13bd50256fe1bfc561a546284d06d7620f0bf2
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 11304 bytes
SHA-256: 351df3cc54487f7d75eae213cf6bb1821a1c531754a22768003b4ef998e6b14c

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