Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eca19e2d0b9789…

MALICIOUS

PDF

89.2 KB Created: 2021-04-03 13:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a6b5f4aad1613dff70d8dac9be3fa67 SHA-1: 0976fbda9572c14f2313f263ef3ff562d72719ab SHA-256: d6eca19e2d0b9789937a70da6509e419dc6534235848d852ee93cb77493f7be7
186 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 of which point to disposable hosting, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://zajinet.ru/award?keyword=benzetacil+bula+pdf', is flagged as unknown and is likely malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/award?keyword=benzetacil+bula+pdf PDF link annotation
    • http://nitesufi.sportsontheweb.net/44003107516.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/12468673286.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/cd083db3-0702-455d-81d3-ecf2c4cbed84/quality_management_strategy_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2876581-11a9-42c3-bc8e-cf544197278a/is_the_book_of_revelation_in_the_old_or_new_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bbb9da-591f-4f76-bd6f-dae05db6bec0/small_engine_repair_near_me_honda.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_a3b4d98303cd4e9e8b28cea3d72c8bff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/tejafuf.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_b926f5fcc0524e19906b9a495d0cbe84.pdf?index=trueIn PDF document text
    • http://dijipola.onlinewebshop.net/cristianismo_puro_e_simples_online.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_496b3ff2adac47208958bf6ebe9991f0.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_cee38f6f826146ed972d5e4b2b324ea3.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_2b4418389a1f442d88ef8da137a8b34a.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_a885c3bad9744c0c88f7049f1f163ac1.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_ea7e698d962448358afbf0842c6e7480.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_bdf9191c9bc640b8a348318dde16cba3.pdf?index=trueIn PDF document text
    • http://futakanawus.onlinewebshop.net/fybsc_it_syllabus_mumbai_university_2020_17.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_c6c93da1882e4aa2a121610eab4dbbe7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasutiz/jibigazugili.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_9a21095ab67b4c37930cdec7d1f0ea9a.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e372d26860d84e479ed9836c7e8302f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01034269-e63e-4206-b50c-79ed65c9fa61/21558062609.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_6c100f1e76ae49d384add40f2dad418f.pdf?index=trueIn 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_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 5116 bytes
SHA-256: ddca08d0df3d6625c6702319993307b1c7fa7dc1ed490616829d87fdcbba5cec
font_01_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 14444 bytes
SHA-256: 2ecac6a1626d29edfb2cc3ac858459480c72b011c623afd688939cda66a8e4ff

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