Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca902ae4a91b4e7e…

MALICIOUS

PDF

79.4 KB Created: 2021-04-02 11:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e35164d56e19beceb6b188434b443125 SHA-1: 1f074544ff488c31b5247de13a33825e971cbf04 SHA-256: ca902ae4a91b4e7edf68b5111a2d42b1e4b1ac1a853d98c64a0d44bb33bc5391
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 designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution, with the document body being a lure.

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://jumiwimov.ru/123?utm_term=rational+and+irrational+numbers+worksheet+answer+key PDF link annotation
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/fitiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_604d1c88dfeac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_60151ed07d924.pdfIn PDF document text
    • https://nekizinatuzi.weebly.com/uploads/1/3/4/3/134325328/keriwifom.pdfIn PDF document text
    • https://juroluse.weebly.com/uploads/1/3/1/0/131071309/7d5a3f46378e.pdfIn PDF document text
    • http://kindraretterath.com/mudixovuxaregidodebanedoxcb7g3.pdfIn PDF document text
    • http://zifasito.22web.org/samsung_galaxy_note_4_cases_australia.pdfIn PDF document text
    • http://bobositufunoto.iblogger.org/xovigonomozegelelej.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/sazirir.pdfIn PDF document text
    • http://comp-arenda.site/35447600272il0i2.pdfIn PDF document text
    • http://rudexikuritisi.iblogger.org/what_is_religions_role_in_society.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://potefedezazox.rf.gd/55250879655.pdfIn PDF document text
    • http://juzavinozil.epizy.com/jobaj.pdfIn PDF document text
    • http://modunatotuw.epizy.com/business_process_improvement_project_plan_template.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_2ef4311c80ce4be09598c0ee7a576e7b.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_bfc7108db207451ca4303fc2feef20d9.pdf?index=trueIn PDF document text
    • http://rewurowak.rf.gd/vaughn_bioethics.pdfIn PDF document text
    • http://sirusuve.epizy.com/pajumixiboxotug.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_a058eea81550418484e7422356e4fe86.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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5352 bytes
SHA-256: 2e7acfd704c0e7275045d3e9e9c0fae69795dedeb4799754afb52c2f0b60dafa
font_01_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 10784 bytes
SHA-256: 8d7b94fd104ab7043825bc77c6c7e305c4ad97e57e631c0f4fb7e968a628cc68
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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