Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7f7d640400cb5…

MALICIOUS

PDF

88.6 KB Created: 2021-04-19 15:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 36d6821059a73483b60b1d68905125b8 SHA-1: 2346d81462926eff52e001eec76324da7bbd934e SHA-256: 85b7f7d640400cb59dc5da1241e390abdec6dfe3e752a0a5a1f8130d8fb8684c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of such tactics to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://leonvi.ru/strik?utm_term=dialectical+behavior+therapy+worksheets+pdf PDF link annotation
    • http://hookup682.site/33520253246cetuk.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/ghghfid/lost_horizon_2020.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/pujifimimerugaborimoboj.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/iCOUqhg/smart_dealership_birmingham.pdfIn PDF document text
    • http://hookup154.space/74775817826iiaiy.pdfIn PDF document text
    • http://yozi.store/habit_tracker_printablezg5il.pdfIn PDF document text
    • http://216tilford.com/principales_teorias_del_poblamientogz9pz.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/92238509478.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/futumajedumena.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/Oii8jjN/jetpack_joyride_computer_game.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/9debee47-0c8c-4617-955f-3144844a6bd1/dogavuwazepirip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801aadd5-3432-44ab-837c-51314a494290/4404497833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e4bd99-f117-45dd-a684-41a43167aefd/dizevugiloxifisila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a056ab-069f-4495-8537-5f6418b2529e/43096029018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48967a16-4554-4028-9245-f2d9876e7512/66613583004.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/common_noun_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ca6582-5208-467d-8c33-49a7cc192efa/sony_blu_ray_player_bdp_bx59_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10945ce2-a509-43c5-bd0b-bb3d94f7e383/55182561418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ca93c5-e130-444f-8480-587c64d22841/10_ways_to_look_smart_in_meetings_sarah_cooper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb1c631-8b49-4d0f-9552-04234e59f94f/dodiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a358c348-c423-4b34-8652-945a84d056ab/bank_59_grafton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8851e09e-313a-485f-899c-b0f514b97f0c/57132974535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0acda8-5b69-44a6-bafe-6389da68467b/kafubosin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731f5546-0dac-423d-bf4c-6696efcecb4a/43814755104.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_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 5700 bytes
SHA-256: 2ac97f014c63d25a5205aa408ba19657085ef4ca1aecf100a7f0638dd46239f6
font_01_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 10984 bytes
SHA-256: ec2b08efa94b1147fa93819fb895dbf60229591523247ac3bb5436c460fe1761