Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4535be47c0949b…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 08:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4302e5920d2079b4ccea93b4706cdbff SHA-1: 4f36247e59b0a6ee171aabe08f18adcf4d8d55c0 SHA-256: ff4535be47c0949b00ea9c31991d962c99af4496387c19ac666629442d74329f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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=site+pour+telecharger+des+films+sur+android PDF link annotation
    • http://hostingureitings.lv/uploads/userfiles/files/27679006283.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/kerasaf.pdfIn PDF document text
    • http://stefani.cz/fck/file/96762583743.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/vodaba.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/90097081523.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/tiwuxulipo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/toramiruzokekirudajolo.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rusawatusuposotilubi.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kovupeluzoxalovimitu.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210918_DC3CCD878ABFA9ED.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bokunukopawumagapebomaw.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/67252650232.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/resuludaraxuzeko.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/fezujamofejiwatoxeteboz.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/24402337357.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/belobenezisisewit.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rakaboxewazafaredunav.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/36246621731.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/51841191111.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51616046386.pdfIn PDF document text
    • http://w-mill.jp/images/file/wezozijawerulugo.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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 20212 bytes
SHA-256: c4c5e82409447f134fa47a13980fa8687c534b65b4b82e11078fda26c8c8e47c
font_01_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 11244 bytes
SHA-256: 6e69bdd984edbc6184151b42261e9c003b72196931c1ebe519cd9d7464c84f21
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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