Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55fe0fd0c0925c8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 15:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 440f0ee3b7f0ab9256a4c33ccf580aaa SHA-1: 42ca4f02c55f2ea7e65844bf2026de01aca5f744 SHA-256: c55fe0fd0c0925c853a1f2b10ac94d8e3f8a0cf561af8d162ac0eb638fe71fca
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, indicates a 'car parts worksheet PDF' lure. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=car+parts+worksheet+pdf PDF link annotation
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/somolusut_ruxobo_xuxudafow.pdfIn PDF document text
    • http://romozulujusa.iblogger.org/71919025491.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/68518504410.pdfIn PDF document text
    • https://kajagutodadu.weebly.com/uploads/1/3/1/4/131437420/goguninomuxalil.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/8314877520.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/rosumiperajum.pdfIn PDF document text
    • https://dukagalirizaz.weebly.com/uploads/1/3/1/8/131856141/jesogupomevutuxal.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
    • https://uploads.strikinglycdn.com/files/5c5e8794-ae15-4b10-a9dc-dc63ad56c5f0/nebesomewolezesososiliwim.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_e10195b967c64d7a8d351ef2b24be936.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41be21f0-9a92-4a81-90cb-e4330321525c/febela.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/hacia_una_arquitectura_sostenible.pdfIn PDF document text
    • http://ralupuwegilad.rf.gd/96944658447.pdfIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_22fe476315dc47c4a3fb875905527418.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/thomas_calculus_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710c3c24-fb00-4f38-9e09-e6d892280807/hyundai_sonata_maintenance_schedule_2011.pdfIn PDF document text
    • http://wumepudefix.rf.gd/radademikuwirejulifoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230c7442-d071-4102-a32f-a7bc052cb7e7/49921543600.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_f0926bc8a42c4cfe93b08238a3dac12e.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_c174376ec73b4597919be3f68a3a6ccb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/7475816107.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_7bc62eb8e66340cc9cefa9388b9d5a70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/hydrolysis_of_salts_lab_report.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 4908 bytes
SHA-256: f8e09677af3af256c9e764bdbb01ba57f065c85765e2a41d71ebc4c689a83b4a
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10912 bytes
SHA-256: 352f62b316f1a7724293bfdb90f28ccbb38f89ac109e5d3fac71f3f70ba1b337
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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