Malicious PDF — malware analysis report

Static analysis result for SHA-256 2548d7e545dd8d85…

MALICIOUS

PDF

82.3 KB Created: 2021-10-24 01:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: faab90627d6b9b0f9e31f6d78c625500 SHA-1: 118ec0bf1d58f2bc7d713cdb1becb9672571a605 SHA-256: 2548d7e545dd8d85dbbf11df35a575f70836997197c518d147104f482b1d8e67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://kavernoklub.com/campannas/file/zobefololeloguw.pdf In PDF document text
    • https://sakkestadbil.no/userfiles/file/25982714861.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/dbb50958f1e1faad47f27c1794554523/pumitobuvivifiliz.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/2481611372.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/5706297216.pdfIn PDF document text
    • http://njchemland.com/upload/files/88077907615.pdfIn PDF document text
    • http://sun-tes.ru/files/file/5615665113.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/raxadezojunur.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/zatepavaxira.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/lizoturutubabalu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3c82886fd9a1ab7984fa2f4490511368/piwojejejugogazera.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/rirovozuni.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/4241025634.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/2824239061.pdfIn PDF document text
    • http://obrazyramix.pl/userfiles/file/rowomodipimowoxebigojig.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/xebok.pdfIn PDF document text
    • http://boldogelet.hu/media/10621889620.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/96952218784.pdfIn PDF document text
    • http://stringladies.cz/userfiles/35392211457.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/silorikeditiviko.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/womirodefab.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/nerugogawesaxenedo.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/luvobekuw.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210911081859.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/tebaniwuvejadutodaravi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=tokyo+ghoul+re+call+to+exitPDF 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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 10608 bytes
SHA-256: 5b7466f3323cc42fc0d748e5077aee6ff2da9a62de76169e1017ad4288266054
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 18124 bytes
SHA-256: 18f36074855d32d1b381ad68804361ccb4a2900f1182079ebe5f1224147bf68f
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1