Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfcd5ecce5a2c40…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 00:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 356bd8578b61ff0c7e3a39449c5ee61d SHA-1: 6dcc5e3a51b824e4089931496a4adfcd486dfab0 SHA-256: 5dfcd5ecce5a2c40331736fbabc35b0010e8cdbcb6957676a4884e8bfc1185f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. This script likely redirects the user to a malicious URL, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://smidgel.ru/uplcv?utm_term=dual+boot+windows+10+with+linux PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/smkjh7nrv9dibbch18hd9h1247/guwaremulu.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/guremowupilodazijogikagop.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/41066359507.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/18472354366.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sebem.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/vedewovibowigakiwonad.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/33812214799.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vedisotosate.pdfIn PDF document text
    • http://change4best.ru/upload/file/35497707007.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/21564322112.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/mewibijaropeparejufe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb81d65851---kubewajukuw.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/jisafibupenolanimiruvate.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/42463604558.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wazoladetafamofusibewav.pdfIn PDF document text
    • https://cet.sk/res/file/noxetekifogudabirofuzabuv.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/13785916166134dbbf4b833.pdfIn PDF document text
    • http://hoachattn.com/image/files/37511263739.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/24051595699.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/16342509254.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_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 17780 bytes
SHA-256: ffba0bcfed2e3d53380ba8e8c0f7a47577a1700b49c949927e7b035db251e859
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 10716 bytes
SHA-256: 48351e0ad5ba0ae44bed7e018a241d6453e447ec335713f5de70605bff842e8d
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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