Malicious PDF — malware analysis report

Static analysis result for SHA-256 455a75fd1843d623…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 17:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 995b5efd1ec5f4e1a0e3229d3a124c0d SHA-1: b20bbc2f31e7f564e20e88d08cb072e8fcbe0a9e SHA-256: 455a75fd1843d623b20847b4ba673d86d0c2aed98ff972fd9645f89cad951929
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with a clickable action, designed to trick users. Multiple external URLs were extracted, suggesting a link farm used for redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 1 text block(s), carries a click-outward action, and is only 67 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://pistant.ru/uplcv?utm_term=area+of+a+parallelogram+on+a+graph PDF link annotation
    • https://e-ssuances.com/ckfinder/userfiles/files/kunob.pdfIn PDF document text
    • http://kustari.net/userfiles/file/32444732760.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/doxelatidabu.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/tagemawiniri.pdfIn PDF document text
    • http://z500.si/files/22301785859.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/kasetitaxidubume.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/12566584190.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/82101319252.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/gefejel.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/22554032871.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/76225016690.pdfIn PDF document text
    • http://bdnchem.com/upload/files/nunijowaze.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/rikoserek.pdfIn PDF document text
    • https://seger.cz/userfiles/file/subamatoxekukabasalatir.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jmh096i196cagh77nnpk41blql/26197446933.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://aviatroglo.fr/IMG/file/48672919160.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/kabuzigisexololeligu.pdfIn PDF document text
    • http://hk-keber.de/images/file/49572146547.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/94800745875.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/19170188032.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/47680466830.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_F033BA6593C9E065.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/kumovesoxolutokikovaw.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/14452762671.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_off0000aee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 10428 bytes
SHA-256: 5223e76d2a9c5ebb8a472dfc1c6678b5babfa1a50f6c60ac955b0bfe3404249a
font_01_sfnt_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 14172 bytes
SHA-256: 9c9652cce836ee2290d9feba1490dd5f61527cebaea949c782486518d999a6a9
font_02_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1