Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf339f0d1a0fe3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-27 02:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 81cc5a18008552fc2926be7ed315aed6 SHA-1: 2c0dcf17371c9b94bc8ec072f60c6e75be4e1bd4 SHA-256: a4cf339f0d1a0fe33fe976204f4d060091a5add2744389820a3e1dd6b537aa4e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to technical assistance. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/strik?utm_term=how+to+connect+my+dell+laptop+to+a+projector PDF link annotation
    • http://lapivakop.getenjoyment.net/furapeliwekapun.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/panduit_cable_tie_mounts.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/dna_structure_worksheet.pdfIn PDF document text
    • http://dufazesiz.mywebcommunity.org/medical_device_rules_2020_cdsco.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/apeman_dash_cam_manual.pdfIn PDF document text
    • http://midimox.getenjoyment.net/fmea_process.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/pattern_oriented_software_architecture_volume_1.pdfIn PDF document text
    • http://rapaliku.iblogger.org/vivadipi.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/effortless_experience_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavawefojob.epizy.com/biveguwe.pdfIn PDF document text
    • http://jitemawuvefogox.epizy.com/kaxulifawetej.pdfIn PDF document text
    • http://dagogedimin.rf.gd/gonimumexano.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/yunus_cengel_heat_transfer_download.pdfIn PDF document text
    • http://sekovukubetib.epizy.com/boarding_pass_template_invitation.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/assessment_in_medical_education.pdfIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_050b7240433c4cc9ad1fb009c0e0fd8e.pdf?index=trueIn PDF document text
    • http://kukadafimi.rf.gd/dojovipuwopimunejovuvi.pdfIn PDF document text
    • http://dilikibabisud.rf.gd/biology_practical_book_for_class_12_free_download.pdfIn PDF document text
    • http://jomusosufetobox.rf.gd/vusogategixiwofakoko.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_0dd92a96f91e4de798ffe9e6ea942efc.pdf?index=trueIn PDF document text
    • http://jimibidubarabus.epizy.com/35129050356.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_d0c7716a3f1848a39a30db15e51cfced.pdf?index=trueIn PDF document text
    • http://sawokinajiralar.rf.gd/92192299410.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_7af542681519402bb234c828ccb49918.pdf?index=trueIn PDF document text
    • http://bibobega.epizy.com/finding_angle_trigonometry_worksheet.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/rounding_decimals_worksheets_year_7.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5272 bytes
SHA-256: e313356cf876ecb05a480d0c041395bd0a38c33dd0d79f672d398084f197ff55
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 11156 bytes
SHA-256: 6be51ee75d7e350415c9d89df66b15dcd835ad8e590637e8d1fb0f0f45f13d5f

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