Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33f29d4bc71464d…

MALICIOUS

PDF

112.9 KB Created: 2021-03-30 02:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cadae6c8a2aeb895b68fcdb420c604d SHA-1: 54a3a2302c07ea61a1face5054d3075c6da3b017 SHA-256: d33f29d4bc71464d07bb4b386001374f2aa934e0e4a31d4a2531d914edc46d58
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=how+to+sue+a+federal+judge PDF link annotation
    • http://idealsit.space/dnd_3.5_bard_handbookgu9rq.pdfIn PDF document text
    • http://dapobapi.22web.org/what_are_living_things_composed_of.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/749579ba1.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/kibikejerafu_fogafi.pdfIn PDF document text
    • http://sarhello.online/45703891015vbx7i.pdfIn PDF document text
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/xudedeg.pdfIn PDF document text
    • http://good-production18.site/stihl_petrol_strimmers_for_sale_near_me6mf1z.pdfIn PDF document text
    • https://gebiworopefibo.weebly.com/uploads/1/3/4/5/134583098/474227.pdfIn PDF document text
    • http://voporim.22web.org/bicycle_repair_manual_download.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/liket.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/b0667752a950e3.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://sugigujetobil.epizy.com/adventist_28_fundamental_beliefs.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_3b28209e9ad84c2984226dae19419fbc.pdf?index=trueIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_83b9aa3c9ab9438397d7d863e7e5259b.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_c8e39af5586e495887f43eec030584cc.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_dbe59498064345ed928252fb56ec13c8.pdf?index=trueIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_e55d08021caf4a1ea31a779c54eb83f6.pdf?index=trueIn PDF document text
    • http://pitalonefizat.rf.gd/sakudetawakamigekojeguk.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_141590dd7277427d9b0665bb0b086e9b.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_8882481afa4c4dd4ba762a6414a8a9c4.pdf?index=trueIn PDF document text
    • http://webeputexewek.rf.gd/analgesie_peridurale.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_15682b5f2211472d9065021de9e5c9de.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_c8de74623eb44b7fb594b2aa15f57ae6.pdf?index=trueIn 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_off00016eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB2 4932 bytes
SHA-256: 1138024221feefb9778c2450287540f76f640b8a9ea1e03a0d0a5e60a5eb6b79
font_01_sfnt_off00017fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA7 11604 bytes
SHA-256: a0762eec54a5664def235dfdf3e647327509d89ccf9e974998bd5637a567360c
font_02_sfnt_off0001a6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3