Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dd601e13d19627…

MALICIOUS

PDF

85.3 KB Created: 2021-05-05 21:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d053021eec8b153d7b1168c501bf49a4 SHA-1: 99946b194b41b1cda2560c15a937df28ac3c7e08 SHA-256: f4dd601e13d196270d3fc519c9d5e562790cfcb2db814d52c033a3ce03785694
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a link farm designed to host malicious content. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=blue+jackets+roster PDF link annotation
    • http://puxekera.22web.org/lasya_by_anoushka_shankar.pdfIn PDF document text
    • http://pewujok.mypressonline.com/41995166835.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/b44gjOw/laboratory_report_3_cellular_structure_part_a.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/bQsghij/29517124916.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jhbrhja/65013558508.pdfIn PDF document text
    • http://xolidila.iblogger.org/dark_souls_2_scholar_of_the_first_sin_walkthrough_ps3.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/25244307754.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/termination_of_rental_agreement_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/mejabutumu/qxgchg2/march_of_empires_war_of_lords_update_36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pavafisufopu.myartsonline.com/kusevewuwetododumotesukad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4b8f60-2d0b-4ad2-ab2b-0e11e664e067/gewineleriwuges.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/applications_of_digital_signal_processing_in_seismology_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafca417-ae4b-4bd7-a984-53803d1f0806/kidejelibo.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_593fe44795a347c8820842289c6eb6b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dc49fb-572a-4361-90d7-88fcb21ccae2/simuvafukubobexofawak.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_d4029413a25143719f4a4583b2905ed1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65c48d6-c989-4356-8d7f-aa44e2b25a28/81291596064.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 4712 bytes
SHA-256: 06e1960f361e7491d30789bd5b98fed95b8991102e9606a88345b9cd9732d5fc
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 12184 bytes
SHA-256: 947f1d0c3215492233dffd223cfedd28b903886b3a31b9ca2f52cc438279cfe0
font_02_sfnt_off00013a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A62 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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