Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd403fa9e58f1c1f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 09:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53b11d5694a9534befdcf0fd647050b3 SHA-1: fb0d36ca34c5d0727b5af20162be613b559a5c79 SHA-256: bd403fa9e58f1c1ff1aee4248954bd0d9fb71a1377e9babb7fa8197597707ee9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure and numerous external links suggest a phishing or malware distribution attempt, likely initiated via spearphishing. The embedded JavaScript is the primary mechanism for executing malicious actions, such as redirecting to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=fastboot+usb+drivers
    • http://sterenstein.ru/userfiles/file/muleleforipuvenuto.pdf
    • https://apra.pl/files/file/zidonatafamagurokuzapek.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/luwuvifawarinixarekobemor.pdf
    • https://interconformity.ro/images/file/belodo.pdf
    • https://greenlandpark.com/uploads/files/pivopososefumonewak.pdf
    • http://foto-recepty.sk/images/fotky/tikitejonixezigekakoru.pdf
    • http://musikpark-live.de/userfiles/file/masikipasozagekoma.pdf
    • http://www.jindatunnel.com/up_files/file/56657297896.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rajivusoni.pdf
    • http://sola-brothers.com/userfiles/file/50866814442.pdf
    • https://poganyvolgyi.hu/userfiles/file/fufigapugenixosez.pdf
    • http://www.tomasjelinek.com/img/pub/file/61245600496.pdf
    • http://sieuthibds.net/images/files/55202675039.pdf
    • http://lepal.sk/ckfinder/userfiles/files/86790921862.pdf
    • http://rbtyutj01.com/userfiles/files/11297499726.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba281b9f4---5219424636.pdf
    • http://clickvay.com/upload/files/firopunotexe.pdf
    • http://giaydantuongphongkhach.net/images/news/file/bedesog.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/17349340623.pdf
    • https://cpc-serbia.org/js/files/6967415745.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff706bf8ca---lotapazodavolenedawerebab.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/49708097317.pdf
    • http://ekonopuntos.com/campannas/file/82668819565.pdf
    • http://ues-rb.ru/themes/ues-rb.ru/files/99633068601.pdf
    • https://endobible.com/userfiles/file/60230604820.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/85344928129.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 16792 bytes
font_01_sfnt_off0000edf9.bin
a87392a9d8deed009bf01b2a1beb358420091c5d10d332ddbf0de100769d07af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10376 bytes
font_02_sfnt_off00010599.bin
e3712c7f6df7eaa2aeca098433a6e6d0edc460d40a5dcf7fa22b343235cbcd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16052 bytes

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