Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed22225165e771a…

MALICIOUS

PDF

74.7 KB Created: 2021-04-12 20:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ee31a1fcf2da4d630e24871fd7681458 SHA-1: 1aa4af16f42930dcf18a6dd62e0b5e4b94408dcc SHA-256: 2ed22225165e771a697e922edbc54552375a9bb794228d818f3560c3817b7c13
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one URL pointing to zajinet.ru. This suggests a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+does+karr+alarm+do PDF link annotation
    • http://cardioactiveuficiale.site/horolovar_400_day_clock_repair_guide_bookhi929.pdfIn PDF document text
    • http://mosdendy.store/tp_link_av500_powerline_extender_manuala5n2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_606028840fa66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_606031f58991d.pdfIn PDF document text
    • http://lp-consalt.ru/sigma_sport_bc_800_bike_computer_manualakevx.pdfIn PDF document text
    • http://thecabinets.xyz/73921986825vd0pr.pdfIn PDF document text
    • http://registrat.space/7602432057ci6zd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_60286eaa50019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_6028ee64a5b6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/where_does_steam_workshop_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/straighterline_microbiology_exam_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/4851548882.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_08686962b3cc47589320f708f576926c.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_fd1059bfcc124f36883f0cd048238153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e3efe2-65ec-4d72-a228-bbda18e0f373/os_5_p_de_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07472755-45b9-4e55-a586-b09f349b8b4e/46673252008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f626d2a-77b8-45b2-b8cc-c9acd96b4666/public_administration_bachelor_degree_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3e7bc5-d4a4-4441-b7c3-ff3fd49e4aec/wovemuwanapapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77097f5b-8e50-415c-82ba-f8c168f6ad1c/5678839546.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/92021639951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa40045-0a20-44e7-a7f3-38c18f92a45d/why_wont_my_ice_dispenser_dispense_ice.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/dell_optiplex_gx280_drivers_windows_7.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_327458c15c384955bdeb3a38931717c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31001d51-7cfb-4133-b2e7-142268c19dce/14488817604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df66fdc-5a25-401e-a4a9-4cfc4ba90fd6/76377894320.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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 5144 bytes
SHA-256: f903ef27d74e309cb4a50cbdfdcdb868faa56ba9dc6676bbe2843eb42024fef9
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 10880 bytes
SHA-256: 2ba8454c40e96bf839a899f2dfa40cfad0c3524962ca84dfbac89cdfdec1b988

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