Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57f2ba152b1d76…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 22:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 556537cf69c4bb91dd1319bfd77567e6 SHA-1: 3a6689be93ecbfd7172e6724f3a7217c92715cb5 SHA-256: da57f2ba152b1d76764fe1d2f2f6fa10288b6fbe8ea668c9aa9a08834f28d3b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=add+predictive+text+android PDF link annotation
    • https://virker-ikke.dk/files/93760793070.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/vusoviwofagogomujixubojit.pdfIn PDF document text
    • http://abnicum.com/files/file/sosoro.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/51928289107.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/remiketorojugamutupowid.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b779e460ed---94155636472.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/jesevesomazupagowevudo.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/43585043791.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/97966574787.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210903190003.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109050702319822.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rerurobusibuwusapuvefe.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/34716062204.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/wapekujomutexevedirubar.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sepenulevuwaf.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/55760347234.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/80631842621.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/77993216930.pdfIn PDF document text
    • http://cobmedia.hu/include/13630676814.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/67356362849.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/buvazejewa.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/13559469185.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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 17512 bytes
SHA-256: 9a08e95ddc3478243d13e54d413cce05cec545f94082da1eaa14fa46c2e9af13
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10440 bytes
SHA-256: 5e79b07c1047a42b45f0a95fb563e23ca6f52ff21f5ed2afd218ad313561d72f
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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