Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd5eaf0c2f5dcb7…

MALICIOUS

PDF

103.3 KB Created: 2021-06-08 21:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e2b930024daa2cfafbfef39ab5c496c SHA-1: 2e4f3442a67d14409c138eda8e69d87348c15758 SHA-256: 2cd5eaf0c2f5dcb7c798fccaab4fa7cda9c24111972b7930458c73e25ab2e294
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/pbw?utm_term=elhain+masteries+build
    • https://cdn-cms.f-static.net/uploads/4496146/normal_6034ef3e4d2dc.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_606e0d1408378.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_60215d3254d89.pdf
    • https://zulewawasukuxu.weebly.com/uploads/1/3/4/5/134581955/04e2702c273087.pdf
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/9776073.pdf
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/dulipo.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_60bbe4d75a59d.pdf
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/wizatakotok-tavelex-jejasedu-guvobejopul.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_6028eae5b350a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zafasuvolo.pbworks.com/f/free_religious_piano_solo_sheet_music.pdf
    • http://fotikeralo.pbworks.com/w/file/fetch/144601527/ethiopian_calendar_free_download_for_android.pdf
    • https://uploads.strikinglycdn.com/files/3aada0d9-66b7-48af-9df9-7775c6bc87bf/what_does_pist_stand_for.pdf
    • https://uploads.strikinglycdn.com/files/5b7470b7-3461-49bb-8cbd-ba5db6549a05/will_there_be_another_season_the_crown.pdf
    • http://wemilamozede.pbworks.com/w/file/fetch/144869442/wuwikogowinedela.pdf
    • http://jawegele.pbworks.com/f/rsum_du_livre_lile_du_crane_par_chapitre.pdf
    • https://uploads.strikinglycdn.com/files/c047ecd4-754c-47ff-bfce-c047acf431b1/gutonifaraponib.pdf
    • http://zusemivak.pbworks.com/f/nexisiwadulidevig.pdf
    • http://wevapejatu.pbworks.com/w/file/fetch/144538473/google_spreadsheet_vs_excel.pdf
    • http://bekiravetad.pbworks.com/f/32455727863.pdf
    • https://uploads.strikinglycdn.com/files/99e61e06-6772-47e2-9fa5-2229d9004552/bobs_burgers_cookbook.pdf
    • https://uploads.strikinglycdn.com/files/05b59092-8464-47b8-b16e-eccc21d800f8/marketing_and_communications_specialist_job_description.pdf
    • https://uploads.strikinglycdn.com/files/a5e2571b-f1ea-411f-b63a-e9d107176fe2/is_avon_skin_so_soft_safe.pdf
    • https://uploads.strikinglycdn.com/files/0d12f15f-5461-4dce-bff1-037e882a5deb/jujubunomogisupud.pdf
    • https://uploads.strikinglycdn.com/files/15c0df5b-a6c6-488c-bd73-ac98852e4d40/40636875561.pdf
    • http://jifesepapo.pbworks.com/f/suwitisapuked.pdf
    • https://uploads.strikinglycdn.com/files/29130e6a-03e9-446a-9ffe-de23fe243476/how_to_put_a_wahl_clippers_back_together.pdf
    • http://wusajigi.pbworks.com/f/wemig.pdf
    • https://uploads.strikinglycdn.com/files/b564501f-c1f7-4605-a1d6-5a248dc4be4d/2612230642.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014077.bin
cfdb045df3686f265578ed43bd5246f9e3a84cc4e5d34b3847883f9594dd6cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 5164 bytes
font_01_sfnt_off000151cd.bin
a4bd14974682e0e30c1bac129624e20fca5cfdbd738d38246cd86efc47f76e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151CD 12120 bytes
font_02_sfnt_off00017a55.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A55 16092 bytes

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