Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eec07b54cc024a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 05:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60da87139bbd7499bdbca17f456b2ab0 SHA-1: 88a163b68ab24fc871cc32ec991fcb8a0d446891 SHA-256: 78eec07b54cc024ad14a7f3f7fed5d9964ece22bc4e7e9a80e00da05823b7aed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=attack+on+titan+full+manga+pdf PDF link annotation
    • https://www.terraton.com.my/ckfinder/userfiles/files/komatonexumibawok.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/57506242492.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/waberadetevumisarukuwipuf.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/xefiwufodekuf.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/begejixunemazabamebawaka.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/91463215981.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/51465571350.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/wafamozewabegu.pdfIn PDF document text
    • http://chromavials.com/d/files/68366193248.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/82990263858.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913031242174.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/31608653720.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tivus.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/19361893938.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/82386136840.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137d991f31c1---migopitasegoba.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zidezamux.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/govafasomasopek.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/geduvobefi.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/3940172749.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/54692937635.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/67337855881.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/jezeturuvebedirefutun.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 17572 bytes
SHA-256: d4cb5e71412ca96f9f356c94c77fcaa655ce101242bf7d6dfd7695098c00f200
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 10736 bytes
SHA-256: 1454d45c3569a60492521832a58d04f0f3a93e7077f267d14fd2a1c9b48f2025

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