Malicious PDF — malware analysis report

Static analysis result for SHA-256 875495ce95875f72…

MALICIOUS

PDF

69.4 KB Created: 2021-03-29 14:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d50450fbd2b40ea212cd2845992abb93 SHA-1: 8098dc4785d2095f34d62f132f677f25388b7c07 SHA-256: 875495ce95875f72a7149df443e3170ac3f29dcfe1f558d411972f6b56a002d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://botokaw.ru/wix?keyword=cell+cycle+activity+worksheet+pdf', is presented as a search result, likely to trick users into downloading malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malware distribution.

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://botokaw.ru/wix?keyword=cell+cycle+activity+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6018a60302478.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/excelsior_college_cost_of_attendance.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/67247728850.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/b33bcdd77f142f.pdfIn PDF document text
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/4735067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601bb4b0435c2.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/wekigupugo.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/balitusikelezowubaw.pdfIn PDF document text
    • https://vokesilito.weebly.com/uploads/1/3/4/4/134400786/6545193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_60558ed1944d3.pdfIn PDF document text
    • http://stickerrus.ru/poly_pop_3d_sphere_puzzlesbc28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_601bb387a0755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fc6d9ffce21c.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/dajojebi.pdfIn PDF document text
    • http://naturwows.space/bewuwenowedogumojbtrqz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamavaremimot.atwebpages.com/archaic_words_dictionary.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_905dd562a7d249b2bf7727d3488ae64d.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_9ff0c20e57664d3cbf2ecb0bc72caf35.pdf?index=trueIn PDF document text
    • http://suxudogakol.myartsonline.com/36387614248.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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 5468 bytes
SHA-256: 55f70c189700e81e008447b327aaccafb7da033fcea31316b8138dfe8fa75def
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10452 bytes
SHA-256: b39c1204de31354ebd39a01d06671bfee1a88ef83bbf2319ab32dd3c6219da0b

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