Malicious PDF — malware analysis report

Static analysis result for SHA-256 7612a646433aecec…

MALICIOUS

PDF

111.3 KB Created: 2021-03-13 17:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7980e600ec1807305e14fffa99b2476f SHA-1: d297639b85cb7d509185ff0da6a8217b18780b58 SHA-256: 7612a646433aececb9645b07b4b6a1eb1ad69f5ec67302e88f8e73006409cca3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://pelibifir.ru/123?utm_term=a+full+form+love PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391340/normal_601a7ea55b045.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/wawij_xonaninilagodir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_604a6abcd2778.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/plantronics_voyager_legend_connect_to_computer.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/2c3313f031274.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/bgc5SHL/44017639433.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/59373016600.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/nabejonar.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/60488385185.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/notes_in_spanish_beginners_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fce193819043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_6043f0a9a6a6c.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/73062806725.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/sirinipurukamas.pdfIn PDF document text
    • https://ramowofotaro.weebly.com/uploads/1/3/1/6/131607053/resaxaro.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Chjgiig/army_pt_uniform_regulation_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/vaO9ib2/bamasaxonomu.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/johnson_seahorse_5.5_fuel_pump_conversion.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/edhgrhg/xefotajonegesitidebibani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_600ea02974e1d.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/72453092490.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/ACgghcf/48089056785.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/dobeserozazefibasaba.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/materials_and_processes_in_manufacturing_11th_edition.pdfIn PDF document text
    • https://bejelasinodajib.weebly.com/uploads/1/3/4/7/134764461/3525800.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
    • http://jusopetikikij.onlinewebshop.net/does_my_motherboard_support_processor.pdfIn PDF document text
    • http://vunonam.atwebpages.com/assessment_center_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 26428 bytes
SHA-256: 9d71fb9ef3505488e8450ba3f50deb2947ba46890f0f0f288331cd85c4ea42f4
font_01_sfnt_off00016af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF0 4220 bytes
SHA-256: 62a59cd0e6e6d3d9615e6243c7393f4c482d6720fc27336a67a6ab05c60b2bf2
font_02_sfnt_off00017946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17946 11160 bytes
SHA-256: ffc20b8729df5d1588d8951ff1b5a1a76719a8c62ec2f7408fbd976b5ac494e1
font_03_sfnt_off00019ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361