Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3ecf3d066544f6…

MALICIOUS

PDF

78.6 KB Created: 2021-04-08 00:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e1f8d1c66467dd759ca74a21a9cd693 SHA-1: d84dde0d58c001908bf720199d634165469204d6 SHA-256: 4b3ecf3d066544f6bfaccb01dcce90f7fb8526bb460025e80ac6c827c73b9ea3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and employing UTM parameters, strongly indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://botokaw.ru/strik?utm_term=how+to+use+fernox+f4+leak+sealer PDF link annotation
    • http://003-center.ru/sherlock_holmes_1_bookxe260.pdfIn PDF document text
    • http://magic-world.site/nederlands_vergiftigingen_informatie_centrum_nvic6tnb9.pdfIn PDF document text
    • http://narexatefaz.22web.org/62024830031.pdfIn PDF document text
    • http://pay-order.info/can_t_format_64gb_sd_card_fat32pnzs3.pdfIn PDF document text
    • http://ergors.space/62347060664iymwv.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://smartroom.pro/boy_scouts_northern_californiaupxde.pdfIn PDF document text
    • http://balewezekowesab.iblogger.org/internship_interview_questions_and_answers.pdfIn PDF document text
    • http://pewusimirunoto.22web.org/2830954997.pdfIn PDF document text
    • http://idealicagocce.site/how_to_replace_a_belt_on_a_stackable_dryer2uj3r.pdfIn PDF document text
    • http://websporizle3.com/bipofufokebokutabakidibj5ro8.pdfIn PDF document text
    • http://helpcenter.business/geometry_problems_with_solutions_and_answersq4yef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiderifi.rf.gd/lagajuwokufim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1b29fb-4c0a-4b5a-bf09-2d87bdcef3ed/can_you_change_the_lens_on_a_sony_cyber_shot_dsc_h300.pdfIn PDF document text
    • http://dogurof.epizy.com/bowknot_platform_flat_sandals.pdfIn PDF document text
    • http://juvugakor.rf.gd/4179907682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5461df7c-4fdb-479b-a976-fceaa6e2569f/tulel.pdfIn PDF document text
    • http://fotexamaluvim.epizy.com/59834869308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6afe834-aa31-4a75-a841-32f3dadc3865/vekipu.pdfIn PDF document text
    • http://posojorodinu.epizy.com/38572298569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ab34e1-aa09-4cb9-a77f-e147c7739b0f/graco_glider_lx_gliding_swing_weight_limit.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_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 5032 bytes
SHA-256: 8e9634f43896b608e532ade200b5dd41539debdee942d036c7a378a7ab6b835f
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 11368 bytes
SHA-256: 334e5d1a4bc19537b89c01a4e7e020e78a8b5aec4401f579bf01d9a01873dcf8

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