Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b52e29ba365e00a…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 06806cb271aefea45473c0f5a6ff339f SHA-1: 2433d045923511b4ff439d5440beba45739cd014 SHA-256: 6b52e29ba365e00a1bfa4a70ea7da3515579d09dbe27e62feb4612e2176efde2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=six+rules+for+eating+wisely PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ff80b29b8574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_6025ede15a211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_602eccbfb37b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5ffce01554b78.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/33600955080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_605309dbddcfc.pdfIn PDF document text
    • http://godupizu.iblogger.org/how_much_is_a_verizon_hotspot_per_month.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60235384a8442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_60327c9594d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_6026633e1e5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_6034566ae3b71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_188ce99b6cfd4dd2940b045b319223ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ded79c-9f06-4299-be51-665e3dd32774/13589607331.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_e20e713007974e779dd07c5969d569ee.pdf?index=trueIn PDF document text
    • http://rokodejufoda.rf.gd/free_blank_ukulele_tab_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be510d9-2fb2-4ca8-a999-ddb4c4b55233/75319741559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07896376-3cd8-4b89-80b6-382d792486ac/living_air_xl15_replacement_parts.pdfIn PDF document text
    • http://tititogejeda.rf.gd/assembly_point.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/promissory_note_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ed43c4-915b-4dc6-874b-1f3f081ea289/27822908524.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_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 5300 bytes
SHA-256: 9b69f63662ab74ba7e4fa6d7fb8d4e1cf89d099e2c2a11901bba721ac10be771
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 11032 bytes
SHA-256: 0b122a75426994c93a092a6a9bb7ebfd2dc67c6e3f07d08061a3fca6e2e87d1e

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