Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f54be55a407502d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 08:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 030d8ca6275bf8b3f686ad58b90c0ecb SHA-1: 4bfa1327b1be40ef747b28ebc05ab6e33ebf535e SHA-256: 9f54be55a407502dda2065a48d576d5f9ff456cb66ae4405b37ec17836132269
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=ap+statistics+chapter+9c+test+answers PDF link annotation
    • http://vowewudimo.mypressonline.com/astrology_and_astronomy.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/nebitub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_6010cf911b02f.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/divibixujen-tonika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5ff2f51eaf547.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/stories_for_grade_1.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/1070715.pdfIn PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/susetakivazufid-tuduf-mimumomujib-mikafu.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/bonaribukexijuk_toxatusewemeta_figelulasavifid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_601badd58ab08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_601d9c1101e89.pdfIn PDF document text
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/raluwoveragoni.pdfIn PDF document text
    • https://fewadagagex.weebly.com/uploads/1/3/4/5/134594838/pujire_xogok_ruwutawesemozo_mevejewinaxewij.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/tuwazuvegugomofudeteweja.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/the_complete_film_production_handbook_fourth_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5ff1c1c6b8143.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/boy_scout_handbook_hardcover.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/menowilo-popezegux-malozanuxe-fibafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_601ce16a70d8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_a91f45562c374d2fb01af7c8e715f85e.pdf?index=trueIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_168a4a08a6d14cada5d3ebfbdb691d4e.pdf?index=trueIn PDF document text
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_c8838a3535c244e3b60670caf63a8b15.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_9ce8c0969c3149fea708bf4f4487b94c.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_ed59db57b05b4fdb851b10e046940a2a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 5228 bytes
SHA-256: b522c483e2d639059d1ba5367d46058a0f3b55cc38cfaf0b23d49209b0fb5703
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 11588 bytes
SHA-256: 5540e35fa9bc92f377fb1599a17d413d271415d2c85f0c400acda853075083e5

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