Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a4f79d8e531cf1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c18c57c74336925133314649a98da8d3 SHA-1: ee86e0bc83bbe78ad0056604478a3f9d2aec5586 SHA-256: a4a4f79d8e531cf15d3aa533e5fdd24b2a1467632c518f70a33928352a9f2ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting, and is identified as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.elstar.ru/uploads/files/67534171375.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3676c914f565fcd60aad77cd47e39096/dijeralofiwebefazenu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/44904436952.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/20364709540.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/19275806851.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/55318783078.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/lopanosuw.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/latopuwiwizoromabunuwud.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/moragatokamozodabigolumem.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/99404540589.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/13880736269.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/15408291208.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/virabokexo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/96379836468.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/52766348831.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/gubolozetinino.pdfIn PDF document text
    • http://wawa757.com/uploads/files/32343192109.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/jorewiputuwosafox.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dalim.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/rasajulexogutelaxonedikul.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/fizobenobelu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f97a1a44---jukawonodesodazenozuzafi.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/lonotevamisubusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+turn+off+pin+lock+on+androidPDF 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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10580 bytes
SHA-256: cbb2bda55e445a84165cffaab0174752fffcab56fe8d48d69d9e6c49df8a1ace
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 17948 bytes
SHA-256: 052e04ec4aa1c2289457e3bceefaf43121109b7e08c6a6d67e8a9ed93f3779d5

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