Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d808bdc7a476d30…

MALICIOUS

PDF

76.4 KB Created: 2021-03-07 16:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0680110322493df781bcb99e832bd702 SHA-1: 2c162ec25b4139e964513b0b5a6cfdf9e7159e8c SHA-256: 9d808bdc7a476d3068d24c27e630c1f700d25233d39c870e0856f6a43e6eb870
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to potentially malicious websites, as indicated by multiple heuristics and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to external content.

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://jumiwimov.ru/wb?keyword=frigidaire%20professional%20refrigerator%20owners%20manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370540/normal_604013c9ee378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_60108ee7d669b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5fefe8f40f2fb.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/7eb86.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/cggXYjd/hit_the_big_boss.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/TXy9Fhg/map_navigation_voice_language.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/vesumivewodepo_busosenikumuwaz_fidakejopina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60278bf173edc.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/jhc9Tgd/farm_story_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/gP1TMjb/espn_tournament_challenge_2018.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/weruzuropuxulo_vetikevamu_sutokevupi_rujefa.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hfxACDh/ww2_battle_simulator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/aggEje4/marketing_strategies_amidst_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/fitigeru/YqhqvAm/37840828702.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/ajaibjd/lafuxezejesafe.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/FLhfheE/dessert_recipes_gluten_and_lactose_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_2f313d23304b48f9a14697673a9241fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafexegud/couper_un_document_en_2.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_eaa1715ea61f4778a443f3938522ad13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/tosofipewemig.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_319f9703f76849ffb54517562f77eec1.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_94864361a2e64bd686a310e4159c0845.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/listening_comprehension_worksheets_esl.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_f5e4c25aba024829b453f0f2a143cd21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/dowefujabobazesiloge.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5408 bytes
SHA-256: f0c5c33b5dd60711e83ed1a6b0ae57ed814315dcbb51d4c32875f22ae87528f2
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 10644 bytes
SHA-256: e356f8cc6999645d4985db0495d8ee0e991cb84fa09ed90b195b57ab3b285aee

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