Malicious PDF — malware analysis report

Static analysis result for SHA-256 62402e5f63e56c31…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bef4d2d2837e5578d7647fffda839db SHA-1: 822d2209a777c7de47056668eab85b4da95f1025 SHA-256: 62402e5f63e56c31a8b9bf9029b535fc08218bc26bede286800fde092398c189
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=ojibwe+language+app+android PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/66135093124.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5786349327.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403ccd81204---ruterezemapofemites.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/mewidanidewe.pdfIn PDF document text
    • https://tivicom.vn/upload/files/45379884955.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/82527283556.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/71320726599.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907141454.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/48282204346.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210914042938.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rofukinomupijotilikexus.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/gaterogofajitomonufuk.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pipaxarozuloroze.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/52766728658.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/14024079726.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/wasibebeporukonipufu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41bc1c586---wuvexug.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/9468691092.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/fimut.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwotemoxali.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/3856978553.pdfIn PDF document text
    • http://harlit.com/upfiles/file/13476909660In 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 16580 bytes
SHA-256: 87ef1db89b991a2f0a0bc1bb5fae6d57f9dadb5bd27eadb8c526eff977f94687
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 10780 bytes
SHA-256: 4c8428dbbf247819c12f5196a14eb340221e3f39e9948979a9d3816b62339bd5

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