Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2c2980b0d9c81…

MALICIOUS

PDF

85.4 KB Created: 2021-05-28 06:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: abcee6d7fd730bdfab3b7f16d5c8ae93 SHA-1: 5cd094d6736f84c8314d2c1b540d1f45ddede303 SHA-256: e4b2c2980b0d9c8108216ff3933e9bc5810e107b53eabe32fe64f5eaf76489e3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links. The primary malicious URL, https://seumenha.ru/strik, is likely used for phishing or to serve a second-stage payload. ClamAV detection and ML classification further confirm its malicious nature, specifically flagging it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=what+are+the+three+major+patterns+of+natural+selection+quizlet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380228/normal_5fdfc9a08945f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5fcaa81dd826b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fdc201bf0669.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/4133704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_6066286530311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_600487f21d35c.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/pujemudipeperawobat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60318a9dbba1f.pdfIn PDF document text
    • https://nupazafusida.weebly.com/uploads/1/3/7/5/137512774/2507531.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/4301623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91709c8b-61ab-49c3-86ec-beab6d0d45b0/gedirevoxaxova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35288996-3c72-4063-923f-a12ee107d628/a_level_physics_fourth_edition_by_roger_muncaster_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef967b6-2769-44f6-9858-bc71f082d37a/what_is_life_coaching_icf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26af479a-0b93-44e6-9492-1d5d716237db/the_white_queen_season_1_episode_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a27ec54-a86f-458d-9949-c046331a5690/beren_and_luthien_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba22f923-631c-43de-a2ff-83f377f2a754/boy_scouts_of_america_store_salt_lake_city_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aad7d21-a5cb-4531-9ebd-fc079497edae/hi-point_c9_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e81b3f-679e-4d8d-be93-b07d4c193c10/cuantos_tipos_de_ecuaciones_cuadraticas_existen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a28a8b-99c3-4280-8e10-c8c4ede05de8/22149818498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd18a8c-63e1-415a-a2bb-9146d08c8f49/9967240730.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_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 5520 bytes
SHA-256: 683c1c4a173d05dda745448eefdb0a82b5d6ff47890e109e2e3c8497f594a4d3
font_01_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 11268 bytes
SHA-256: 7c5926cb1f08db88dd027ed5eab6e959de7743560c94040adc2f5caf2f732f0e

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