Malicious PDF — malware analysis report

Static analysis result for SHA-256 937b9526ba7808e1…

MALICIOUS

PDF

73.9 KB Created: 2021-02-20 21:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3182c24878f685e9fc2064bc1aea150c SHA-1: 13bae03afa7110f02985631e473e18bdccd58800 SHA-256: 937b9526ba7808e1a85b1b6039b71e73681937e67420f066f2670f07b7d03d8b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing sites, and the document's structure indicates it's designed to exploit users by directing them to potentially harmful external resources.

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://baarspo.ru/strik?utm_term=is+cbt+good+for+ocd PDF link annotation
    • https://getawupib.weebly.com/uploads/1/3/1/8/131856556/nodujizazo-folekoneno-duserewawepeb-jekuditam.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/7372717.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/jixefikimipa_suvev_ruxoxubar.pdfIn PDF document text
    • http://zesamoa.online/pubg_mobile_hack_android_no_root_apko5fx7.pdfIn PDF document text
    • http://agreevudb.rest/22914448765qyrsc.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ljaihg3/infected_gartner_duct_cyst_radiology.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/c5d3d56797d.pdfIn PDF document text
    • http://roflan.site/74071863937om4n0.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/difusazadolos.pdfIn PDF document text
    • http://bloodcraft.online/lepefevumelt7psj.pdfIn PDF document text
    • http://mazafaka69pussy.online/elementary_linear_algebra_11th_edition_sladeruu1lk.pdfIn PDF document text
    • http://dkmz3.club/neonatal_polycythaemia_guidelinest6en7.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/xovope_tolema.pdfIn PDF document text
    • http://grusha.space/introduction_letter_worksheet18man.pdfIn PDF document text
    • http://artelamp.store/openssl_cookbook6dlr5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5024 bytes
SHA-256: c365194c21ad12eca65788420c3fb5d6a8c64d7e69359fbc9b7ad5d96f01b0cc
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10468 bytes
SHA-256: b032f56bcc8da184711eec2b0399df3f724289252250432d1f065eb1b7a95fc2

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