Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0bef99e405f472…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 06:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4751e54988c0ec26aa88fa573a20d22b SHA-1: bc4e8b4e70e2685bcb25818cddfd888d98b46fe4 SHA-256: 0f0bef99e405f47279c8c992b025b3a3ecce3035bc471cf9bf87c0034e7a80b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the primary attack vector appears to be the extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=why+does+my+android+phone+keep+closing+apps PDF link annotation
    • http://vdtonline.vn/static/uploads/editor/files/rekuropavotudimuwedexe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e2fae2f2---borabaviwile.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/wevegomunezas.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/32128544036.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/9639690177.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_114919.pdfIn PDF document text
    • http://topp.pl/_topp/file/88833157048.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/taninoxi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/54313d48e8c77b4d9629a2f6264fb083/saxosag.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/revokifobemuve.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/dofupisobuvilewefadaxaxi.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/xigetizepowora.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/tuxozikimu.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/tijulujomimomuzesakuvep.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/63474361091.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/15218016418.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/damaxemuvojinijuti.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/98968657033.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/99384554295.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bilefatorid.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/57465392310.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/74705356386.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_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 11060 bytes
SHA-256: ed96c0612e437698a55325b965a5ccc8e6315be02458a34813a6119035df7603
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 17876 bytes
SHA-256: e29355183ac40ad4dfca841526af30c0ea3fc1bb48df5064c2eb740d2ba9cd93

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