Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d42700ad55823cb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 09:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 41fb87d32f49899aa6342da94dbc29b0 SHA-1: c9dbff81f3ecf1cb73a2b45f90a71b79103835a1 SHA-256: 0d42700ad55823cb005ab5d6954593771057fa246b1124fa2aac15b2fbd762d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to PDFs hosted on various domains, many of which appear to be disposable or link farms. One heuristic specifically identified a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ptichile.cl/userfiles/file/49373106512.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/jawadajobuxubawe.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/70876545855.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/topojefuzawizadupe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5c0a34fa5339d2201ec911f23dc1d020/kunaxovo.pdfIn PDF document text
    • https://5udua.com/contents/files/66833952431.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zibigurunupilu.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/gajuxofureradi.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/panoger.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/viletevopo.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zetag.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/15886331289.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/vopegegotowasevusegi.pdfIn PDF document text
    • http://eternoohydro.com/d/files/134090564.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/77129451608.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/daresojorase.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/woripenopi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/67778692640.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/bojowoforusimakome.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/fajopegegogitegigu.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/1430577136.pdfIn PDF document text
    • https://beautydent.hu/editor_up/47636951643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+write+protection+from+micro+sd+card+in+android+mobilePDF 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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 11064 bytes
SHA-256: 2d32d5570d45c512b17873d20f9cbf278ccb85b9185beb778da47be69c0ac501
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17076 bytes
SHA-256: 742e3c9a1ef5c3e8e9da3704864601e046413a67bb0c3808e132cf9efca17d2a
font_02_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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