Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fd378b27f42022…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37e645b9593c4735ebebcfdce47c4be7 SHA-1: 168819665a65c0c1ac9dcd2d439cb49ea3927d79 SHA-256: f0fd378b27f42022479748fa3aad6c959b621190007c87f866b3adb4c70e93e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, indicating a phishing or scam attempt. The PDF structure and embedded content suggest it's designed to lure users to external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=how+to+connect+usb+modem+to+android+phone PDF link annotation
    • https://giant-nano.com/app/webroot/userfiles/files/nifusirapibavemojakig.pdfIn PDF document text
    • https://pokereshop.cz/data/file/kunoxusametigilazawilok.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/zopazotamorasagokuroliroj.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/betumegifuwesir.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/13099362910.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/50827068716.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/gotuvozebor.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/23519386332.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/12110430464.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/zuwij.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/paxefi.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/pakuwesumuxeb.pdfIn PDF document text
    • https://slide-bearing.com/d/files/nowevefumedono.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/48006674836.pdfIn PDF document text
    • http://krzeptowski.pl/file/lapojozuminavibadikogo.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/vodemasesubesina.pdfIn PDF document text
    • http://hla.vn/upload/files/1240650670.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forezakozejikobavogufav.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3877b6e8057022d0b6e540005fd8f16c/tilagunu.pdfIn PDF document text
    • http://enewind.com/pliki/file/diverunenolarifi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/18723912e3c099f31031fea41a0fb752/pafafadegitasifugaju.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_off0000bc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC27 11048 bytes
SHA-256: b779e4eb5dbaf6d95bda798b88d8481546a36272f3892745f4ed369921d266dd
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 17104 bytes
SHA-256: 2972c9dcbf1f869bdc401880c757e605a93bef15325e676b0c8d639c28505a6c

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