Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82447908e22386d…

MALICIOUS

PDF

89.0 KB Created: 2021-05-21 12:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6e9c8a858d9fa746e2cb788dc7fadfe1 SHA-1: 588a184b7be3c2f41ac44d2bffce00ed8d3f08ac SHA-256: c82447908e22386dae1b5eb47a3eb1e646dfdcae5915c221bdbf32c06448edaf
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://baarspo.ru/strik?utm_term=how+to+enter+bios+in+acer+aspire+v5' is a primary indicator of a malicious redirect or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=how+to+enter+bios+in+acer+aspire+v5 PDF link annotation
    • https://kakenemewaxe.weebly.com/uploads/1/3/4/6/134655752/4722093.pdfIn PDF document text
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/zafuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_606e38e965bfe.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/80efc3.pdfIn PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/gamukamus.pdfIn PDF document text
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/5847426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5feedb8e8403f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fefbe69da82f.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/c60a96ba-9115-4c07-bb3f-4fbd39997466/polk_magnifi_max_sr_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa42a3d-d1da-4bcd-ac79-530fea81a5d3/plc_programming_classes_in_chennai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca336b1-dea3-4574-b360-34a0920ce6a4/83393434957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee32ea4-86ad-4601-8628-7b0e29078252/jagimebukobariloganixef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc345c50-83f5-4934-b7ec-169fa7ce41b5/marketing_management_kotler_keller_15th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6b6b63-f4cd-461e-b5e3-089df230fc3d/xevoxakikavisokexizaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1768825d-a6d1-4af7-92ee-19a24cca4e28/gazuwanakobedajetojunaxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e81487-9142-426e-8ec1-44cf7a887c31/when_should_you_take_the_fe_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c5a4f2-b1da-412a-a6b6-86c33d47a2fd/55019808251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb6efdf-df4c-4584-9476-47dda4061bb8/the_odd_couple_playbill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a38fec3-207d-4610-a0fc-0ace768593f1/lerujiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eda772b-710f-49c4-b689-b4c1136c8e86/47696314391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500b95cd-c2b3-4e6b-831c-413515f4e3b4/is_diesel_a_class_1_liquid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1371a7d4-5a2e-4e43-a874-21014a06c6d0/oldest_picture_of_a_king_on_his_throne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b99dbd2-6428-4562-b889-ffbdd73b0644/kegofuvimilopavep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5120a33f-bff2-4b05-b4fe-56494c47783c/subaru_ea190v_pressure_washer_electric_start_battery.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_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 5272 bytes
SHA-256: 209032e0a28def26a9365a5f5164162b1746e9fb8dc743072f179a0f52fe761e
font_01_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 12096 bytes
SHA-256: b68b8fdfa7720d195873112da17dd180500b0a5b3c87058c2d8a239c8cb2f4e1