Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e14c8140b298882…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fd04662a6ae03529f380b0750f9456fa SHA-1: 6956d5463bd4ed3067f2aeaea733eac2da62b1c3 SHA-256: 6e14c8140b29888219af7f5e5f311661fd66523c24fc86a1e50ca6376f7f681a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common attack pattern for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=pokemon+light+platinum+exp+cheat PDF link annotation
    • https://abicecream.ru/ckfinder/userfiles/files/83412078826.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091706545856721.pdfIn PDF document text
    • https://riwg.in/userfiles/file/29216832544.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/92311391207.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/55917588435.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/kelixegojawomuperego.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/bufamiwutawubobumere.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140847107747.pdfIn PDF document text
    • http://huefpdf.org/upload/file/83893352110.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/22091955329.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4f1cfe92ab7a6e255a3154e759c5bf7f/70252787133.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rigikufofitap.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99976736792.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/wiliwufinuzadoxosoka.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/60485372046.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dekejiriwedup.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/64925337892.pdfIn PDF document text
    • http://wernitznigg.at/files/93703652783.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/latinadinetebilorana.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109011158416817.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138131938215---wejuguf.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/86682520413.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/74616285479.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/gakiwuvoxudoxuxepulefuf.pdfIn 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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 17392 bytes
SHA-256: 481b07bdcf40ae436c9727f8bb37c1377e238fcb8c83c969a87413bf511180eb
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 10848 bytes
SHA-256: a62040803c2164d2db9385af41d6f2e79265c8a583da310b06b8cd30e0ff9f32
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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