Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9f3f41d5c415ca…

MALICIOUS

PDF

114.6 KB Created: 2021-03-29 16:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 94c4cb616b3b883f683cb8ab6de41a96 SHA-1: 23df3459d151a8cc32fed94782dc0b05f64f41a6 SHA-256: bc9f3f41d5c415cade14f8e695756ebae3d6336b23bf24ed167e76e0a3cb9e7c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, containing numerous external links, with one specifically pointing to a suspicious domain (botokaw.ru) and others hosted on disposable or potentially compromised domains. This suggests the PDF's primary purpose is to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=liberalismo+economico+pdf+unam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6056f3bc190d1.pdfIn PDF document text
    • http://trokot-roznica.xyz/cajas_de_carton_english_chapter_19sly3.pdfIn PDF document text
    • http://thailandlove.site/who_moved_my_cheese_spencer_johnson_free4knba.pdfIn PDF document text
    • http://beamorem.com/photosynthesis_worksheet_5th_gradetu6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_604206d63775b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415944/normal_600802b3228a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fddcf3d6eeee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_606159172cf76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e80b927377634aba89d95356d0ff9d09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2125f5ec-1523-4da4-9245-12a797e1f493/national_dolphin_rv_owners_manual.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_1f511f2830df4c8395cc98288989cc96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb43f903-29ea-49b3-9f0d-ad0df402c04b/wizards_of_the_coast_pokemon_card_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/xutenujote.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_9cbf98ee566f4b5d952dbebb884f88d7.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_341dd86f6c0f491ea367f5c35f35d8b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/pasigonowobadinuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344eb0a3-fb1f-42cc-bdac-6456753a056f/lolugopoditazaludojutimon.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/annotation_guidelines_meaning.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_264673f80184450bbfe34bf567ce3c81.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_8da7d2d66024487b80122df0a2dbb93e.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_bf4df0dac3684f00a707befb19e95eed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/003e9ea0-c433-4430-8900-8cb6b62761e3/weathermaker_9200_code_31.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_off00017fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE1 5384 bytes
SHA-256: ac192e08418cbecb0924eb83af9b21d4da329375007f1552886720abf26344b0
font_01_sfnt_off00019215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19215 12592 bytes
SHA-256: aede0fb73a226601035cd76103cc7b34dce0c5f51e91489586ad77b11475beac

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