Malicious PDF — malware analysis report

Static analysis result for SHA-256 942c5caf9d4d038a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 11:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 389acdd56109f69c44b9221ddc1d5799 SHA-1: 6a87d565feca28960240ab7c80e4ce50a1f44d84 SHA-256: 942c5caf9d4d038af13f6cee37525f729e80a958f2a36f87011de98e11255036
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://studiomuraca.eu/userfiles/files/23830015644.pdf
    • https://war-old.its.vn/new/userfiles/file/mudose.pdf
    • http://air-separation-supplier.com/d/files/bafub.pdf
    • http://veterinariomauracotti.it/userfiles/files/84259805602.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210901_7A02B6056D623C83.pdf
    • http://watchimport.eu/userfiles/file/litidolugi.pdf
    • http://fuerst-architects.com/uploads/file/wujitivedokovupofof.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/45530012901.pdf
    • http://costruzionibulagna.it/userfiles/files/bazusanamejipenet.pdf
    • http://artsar.pl/userfiles/file/9136919101.pdf
    • http://fygl.net/uploads/file/090145322391.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/88110490311.pdf
    • http://snieznik.pl/userfiles/file/xizoromuwasasesamazita.pdf
    • http://eortak.com/img/fck_temp/file/fetokupimigixasasowoke.pdf
    • http://a-aqua.fr/ressource/site-image/files/11859011335.pdf
    • https://iwanbim.iwan.co/userfiles/files/11283538964.pdf
    • http://perfect-aerosol.eu/userfiles/file/81484312687.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/67542532996.pdf
    • http://farmaciafoglia.eu/userfiles/files/47700211253.pdf
    • https://imihwa.com/uploads/image/20210906/files/20210906033441.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/16259322961.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+mobile+free+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 16792 bytes
font_01_sfnt_off0000c825.bin
8fd6ab51f6d8554c3747483f6ea73d265d7e9ac4b1db60df9f513a948c49ec78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 11016 bytes
font_02_sfnt_off0000e195.bin
07fcc2b6b88169be46c5c17c954a242ec9add37ab70faff583b416720af3b216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 16528 bytes

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