Malicious PDF — malware analysis report

Static analysis result for SHA-256 441b2623f8eba5a7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 05:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6087ce076b926e12fcacf31bfe0d7f6d SHA-1: bbc1373ca1855cac73ee1e9bbce5ac4f702d7b8c SHA-256: 441b2623f8eba5a716f7a5b8322b58345741be4ef8b8967457213292c682b0fb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and a small file size. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=android+bluetooth+issues PDF link annotation
    • https://parkettworld.com/upload/files/vosuzonojezivomakanog.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a60177bf---26095339827.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109171516423919.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bobulos.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/voratumusitobaxusox.pdfIn PDF document text
    • https://yellowstonewildlife.com/73311278650.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/29736585745.pdfIn PDF document text
    • http://infosierra.es/images/editor/zukuve.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/33529322624.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/65788011159.pdfIn PDF document text
    • https://webmenuplus.com/images/file/71932189059.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/70919427857.pdfIn PDF document text
    • http://kvrhousing.com/uploads/tudunedugoxopadipog.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/furifinabokosurusifarate.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/pibepajakegiditezulog.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/diwuzatuza.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/sidobilexuva.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/juletasoz.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/44175229587.pdfIn PDF document text
    • http://climtech.com/files/files/56242988690.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/75073488060.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/4115589107.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/tupatunimanuvisima.pdfIn PDF document text
    • http://119pump.net/d/files/30893779333.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d70897581---jadesatelox.pdfIn PDF document text
    • http://swhos.com/upload/files/naruzefikunubejosetabumi.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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 14028 bytes
SHA-256: 6d3e4f9ae9a33b21869cf5a1a7c2af2be19a57797cca9cedce255ab297387d16
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 10404 bytes
SHA-256: 9ae0a7346387453bbf5860baf1823592bf77532f8bdbfeec042e4559bf08790f
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1