Malicious PDF — malware analysis report

Static analysis result for SHA-256 e004e1b8b3befd45…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 10:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f023356a8563320490e99c4ef426699 SHA-1: 9ddf1d73cdeaa7f2abee491946dac576bb50e484 SHA-256: e004e1b8b3befd4591ae09930371207f6f67af50e75ba7806b1c907526a7f989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=change+lockscreen+clock+android PDF link annotation
    • http://project-lovcen.me/userfiles/file/28686859547.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/jivipagawuziwofakido.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4977521813.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kujagudagalaniwesodob.pdfIn PDF document text
    • http://abnicum.com/files/file/savubemogukiditupa.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/vudefi.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/30961842494.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/repavatopu.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/zelobowitabuludexanigu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/98963106579.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/fijuzoxoxegulaxizap.pdfIn PDF document text
    • http://stevis.cz/files/file/58154899667.pdfIn PDF document text
    • https://domilot.com/uploader/files/84538326078.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/3702818008.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/3751217771.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/21744588260.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fidotat.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/ritinatida.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/60708837825.pdfIn PDF document text
    • http://zae.me/datafiles/file/vosar.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bubelebobunixozufitexefex.pdfIn PDF document text
    • https://mavibusiness.it/file/50923378867.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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 16460 bytes
SHA-256: ac4a1e52a5804ab9c0b353cd9f91063c9dbee1a01d0de255c60a530cb3c56ae5
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 10676 bytes
SHA-256: df974036e13a862eeec815699da338d8473357036189123a5583c9cb8aa9444c

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