Malicious PDF — malware analysis report

Static analysis result for SHA-256 441f0e647108d61e…

MALICIOUS

PDF

96.7 KB Created: 2021-10-07 10:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d6826223abc26b430309d3d545cbfde SHA-1: 8f2f6dce84e5dc80fbde1d6e07d2e631f9c34b90 SHA-256: 441f0e647108d61e98f9f72a538e019089c77a419b68b297340aeb236c20cdfb
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 part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=summary+of+the+strange+case+of+jekyll+and+hyde PDF link annotation
    • https://ihotel2b.com/upfiles/editor/files/rikegabuzeruxafifire.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/noragavawazex.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/48008659622.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109270917498061.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/94640506266.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/zonevazoxunisowulefugefi.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/rezunadibanegafufu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/75145098523.pdfIn PDF document text
    • http://brukbet.com/user_images/file/maraxemabiditeso.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/66945695207.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ralatunonojajat.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/56409772197.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rojukesemujoriz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6srk8rp3glcegn18i7iju0p7db/93622538132.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/7733980980.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/38299569855.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/5927080511.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/82304851504.pdfIn PDF document text
    • https://agatanorek.com/files/file/38086331997.pdfIn PDF document text
    • https://pindimana.in/uploads/file/likiw.pdfIn PDF document text
    • http://mitrasuksesku.com/userfiles/file/34081470956.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_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 20988 bytes
SHA-256: 408d9fb47242855cbc4830a463a44c3f5ae4ada4b940c9212c5be4874c21e1c6
font_02_sfnt_off00015a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9B 11340 bytes
SHA-256: f497905614383ed46d7e4e87808c80325ff71cc3c87e0c3cf29cdeb2b5eca333

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