Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f79f21505cd6da5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 18:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0280a63b13281f24ac54b40a24897991 SHA-1: 09b024d7a5036227087c9257ff965a8426c2fe92 SHA-256: 0f79f21505cd6da5653c0191267a37ca86d641c53bdcbfe4c6b789774c07546a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were extracted, the presence of external URIs and the nature of the heuristic firings point towards a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=renal+dialysis+diet+pdf PDF link annotation
    • http://kuzexamipapoxip.medianewsonline.com/capital_structure_mba_project.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/abas_3_scoring_manual.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/mems_accelerometer_working_principle.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/bufomulanasepe.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/rozerizejibepi.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/nugevej.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/53847927065.pdfIn PDF document text
    • https://nenovalo.weebly.com/uploads/1/3/2/7/132712003/01e2b7a908fc.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/carta_de_apresentao_da_empresa.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/tutefajifeg.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/26329501101.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/mavivekepikusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b2226edb-fa83-4a34-8c63-a6017c8b3a19/6198905396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0ee909-b789-4efb-8b0c-845717ff64a9/fugudatenokolumepajaf.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/92731240623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367b99d6-187d-4a41-bf9a-18dab93b548a/pisajusalexezexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9422f62f-5e35-4cbc-8365-32a445eecf6a/lg_washing_machine_repair_hotline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57acb2aa-9f2d-4559-b667-9152a3eb161e/jefisolevodasipaj.pdfIn PDF document text
    • http://benamow.myartsonline.com/63607141403.pdfIn PDF document text
    • http://jokosen.atwebpages.com/cute_black_boy_names_that_start_with_t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27d9660-9445-4f3c-8f70-e6a3e10b8273/taranis_qx7_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 4728 bytes
SHA-256: 197d16d988a256e60435742cbde33a10de69c9c9067da3bdb1c0eaae9e162f38
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10404 bytes
SHA-256: 134151471fd7f5aacc0a63f3dadd761e8b587671b90413c659ec21e1dd766c08
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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