Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f1703e5d462e99…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 16:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f2191c11fb0e96f09dfac9e45dfb3a SHA-1: 21312a639ed302ef6d6acc809fe1e0dc9b7dc72c SHA-256: 36f1703e5d462e99ff04a7a1b834e0a804e1ceadf7b40dc74c9874f9c0363fd4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or to host phishing content. The presence of an embedded URI also points towards external resource interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=breakfast+for+blood+type+b
    • https://cdn-cms.f-static.net/uploads/4451544/normal_60523a4ad4398.pdf
    • http://xazonojader.mywebcommunity.org/case_files_surgery_5th.pdf
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5fcddcaf15878.pdf
    • http://mukinokelek.mygamesonline.org/filo_actinopoda.pdf
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6031df85c1784.pdf
    • http://saxosoxajivovud.medianewsonline.com/effects_of_international_migration.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_601be9040a1c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_8a5206efd8a74aa6b40485b4103327f6.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_3fd2c0f276bc44378418a8755af5f4ba.pdf?index=true
    • https://s3.amazonaws.com/puretulenuza/mkv_bollywood_movie_free.pdf
    • http://fazovalekotevo.onlinewebshop.net/6239947161.pdf
    • https://uploads.strikinglycdn.com/files/e682d0cb-5742-447d-8de9-00b8684cd434/gudekesogikovebafolugofu.pdf
    • https://uploads.strikinglycdn.com/files/61428cfb-5152-4ea1-b0a1-636fea8de7e3/84367627391.pdf
    • http://namezenidel.onlinewebshop.net/13404825392.pdf
    • https://uploads.strikinglycdn.com/files/db6561dd-cb24-4eb8-98c2-53c1a091fff1/69190382143.pdf
    • https://uploads.strikinglycdn.com/files/55c524aa-94c9-4a5b-a246-cb0751a94391/82357320251.pdf
    • https://s3.amazonaws.com/jenisozazewubo/xelasozowupuzozibaw.pdf
    • https://s3.amazonaws.com/zafibimutadoti/789822180.pdf
    • https://uploads.strikinglycdn.com/files/6bd0da26-18b0-4ee7-b238-6b1ec19c7bd7/how_to_write_a_personal_development_goal_for_work.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/how_do_you_say_mandarin_orange_in_portuguese.pdf
    • https://uploads.strikinglycdn.com/files/1a8b68e3-89c3-405e-ad0d-6c7f608484b4/39649793941.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_a888db1eb6d24811a82c03c56201dbdc.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f320.bin
598a319fa91507d66f63f49f5094cb405bc06452486e62b65c6b688b7cae5041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5392 bytes
font_01_sfnt_off0001058d.bin
b4d75329164bfb88a08c4d43c5d42fab42e3ffc58d39ab7b898bc3d8839ec5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10944 bytes

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