Malicious PDF — malware analysis report

Static analysis result for SHA-256 a944a1191db2dbcc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 00:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 175c623b68315e28e84f1778a067c158 SHA-1: 767de92a42392d5fc7eb0a8150bb7049cf6999b8 SHA-256: a944a1191db2dbcc75c577b0dd120a644d4d1918e03afe5de93568b45eda1a76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://istocdukkan.com/userfiles/files/6742624486.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/fekiwake.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vofatoj.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/96081294921.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lutepozipeg.pdfIn PDF document text
    • http://isgsrl.it/images/file/42811558001.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bixomazi.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zetexalebutusejadubuje.pdfIn PDF document text
    • http://novafish.it/userfiles/files/daxapilowof.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/duwowegit.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/84229173399.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d78bb4c656---jozinujewajop.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/69231117966.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/wajupubekofo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/934454887.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/45137004649.pdfIn PDF document text
    • https://hiroyoung.com/data/files/59424313885.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/80009036019.pdfIn PDF document text
    • http://inistor.com/ufiles/files/95528633049.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7da7289f---mipemuzona.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42594385036.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vatojupowuxisivibep.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/58546074624.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/23212633653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+java+notificationPDF link annotation
    • 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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16732 bytes
SHA-256: 9eb3648713883f95b8fd35ddbb917b25d7c7262220ed82f4c9c6b23554dd4e7f
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 16584 bytes
SHA-256: 51fe9d7433a7633ca274cd4b6d393ca9423d96eff45f955c6315678da715cdff
font_02_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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