Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dc19cf2d95e4c7…

MALICIOUS

PDF

79.1 KB Created: 2021-05-13 11:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 557d4fa80f761798eb2aa2bb25198c16 SHA-1: 4389a8f14bbdec039562d03bf9b38220f76d79bd SHA-256: e3dc19cf2d95e4c77a6e3895656467f1b063cd754deb2cafa0a03b54916f98fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL pointing to a suspicious domain ('ponafet.ru'). The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://ponafet.ru/strik?utm_term=how+to+change+battery+on+barska+safe
    • http://stonersfranchise.com/fufibesobuwikopexugozhpsp.pdf
    • http://ipatovaalena.ru/linux_shell_scripting_languagelodfr.pdf
    • https://vekadewozume.weebly.com/uploads/1/3/0/9/130969331/bafuj-wetew-nunovejuv-kedalitomubo.pdf
    • https://cdn-cms.f-static.net/uploads/4408873/normal_603a92ded9f91.pdf
    • https://milarenu.weebly.com/uploads/1/3/2/8/132814898/xinirijajixar-lugilake-filenuf-siferujakipide.pdf
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/22925.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6059f34dc3a76.pdf
    • http://goromeo.club/77615904313gup7s.pdf
    • http://parhelifrl.space/que_es_metodologia_dela_investigacion_cientifica_wikipediadtkr7.pdf
    • https://lutijalejifepe.weebly.com/uploads/1/3/4/6/134649522/funuvuwufexelup_womovox_sibot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_4dd41854df984799a11428a0a6c5c0eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e85b01a1-8907-41b3-b017-16dbf6f09461/64337587757.pdf
    • https://uploads.strikinglycdn.com/files/bcae9bdf-e005-45ca-8312-fcd5e1e4cba8/wemaweratoz.pdf
    • https://uploads.strikinglycdn.com/files/130f6aa9-4e16-4244-a2eb-4646bd20a466/what_is_chemical_structure_of_petrol.pdf
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_8b622a152c0c4fe7a49aef9f5e3d1b4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4377b22c-56a6-4266-a05c-996dd2df6f75/movazi.pdf
    • https://uploads.strikinglycdn.com/files/e3bb501e-27df-4a27-85ec-6bc5fd967f0d/sasumonujunovarasuva.pdf
    • https://uploads.strikinglycdn.com/files/e72c6eac-b625-4f4e-9db8-2d57e38c8805/is_this_water_sanitary_video.pdf
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_ed616c177a23465ebe72413b2e712c62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7a319ec-dbc7-4b0b-9d2f-4ae7c845e1c7/evenflo_car_seat_installation_video.pdf
    • https://uploads.strikinglycdn.com/files/e80ba87f-83ad-45b7-bbff-dbfe67c9b13c/zegetinibusubilevej.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_241280af04994946b00a32fea51f81e9.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_off0000f411.bin
c79369c27c665303b47e58918aaa27811eecfa2184c28b866fcdf3a7c2bfcb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 5468 bytes
font_01_sfnt_off000106c4.bin
468821885622986b2a2ed39bc65a0e9fec58b2e8d9fafc93ca9a9cb0f556dbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 11716 bytes

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