Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd9757474e8581…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 21:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff09c629f9d5b60795a6dee07596f052 SHA-1: a58b50ba05054dbd8946fa58e1b225dac5db1d56 SHA-256: 9edd9757474e858159d43eebab33fe873c5c4017310e08d3ed3a4b66f0872134
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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.
  • 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 http://kondicionery-pushkino.ru/upload_picture/file/94310621397.pdf In PDF document text
    • http://cardealer-space.com/js/upload/files/worodiwolozupisupenuxevep.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/92007657050.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kodog.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/sulobibikasewop.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/70140714996.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/42429391340.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/95526458072.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e4acd16b37edc4c06ea5acaa62e5ebb0/76777553464.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/riramobus.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/fakivusemezajezek.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/18443595252.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/87118854849.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/3298820686.pdfIn PDF document text
    • https://wrd13.com/force/file/4158291923.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/valijana.pdfIn PDF document text
    • https://superpart.com/files/48367334174.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/61285402568.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/25549537106.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109060600119586.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/mopewaruru.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161333fac22f86---98901604092.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/54958624367.pdfIn PDF document text
    • http://kaies.net/upfiles/file/jusulupopa.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/gunogugokenotus.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/2820275355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=walking+dead+season+10+download+mp4PDF link annotation
    • 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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 15296 bytes
SHA-256: 363a0f14c899f88812e2cc5669f2c5659c01dfe044331b750ffe1c60a7e7283a
font_01_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10960 bytes
SHA-256: fede10227e90ae2b69062b79be4b87e66a0745400216253c43882748ac7e35a9
font_02_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1