Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ea0e7b5d80373d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 21:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 417284c78cbf4262481c757ffb57bb8e SHA-1: 9023a66fa4f11e44336b8f615b4c2694351193e9 SHA-256: f0ea0e7b5d80373d27acd3ab0d6eb3f5cd5970be40431369a3e38babdcc778f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.insight-assessment.com/ckfinder/userfiles/files/xudetitigigo.pdf
    • https://lingchuanfloor.com/app/webroot/userfiles/files/25497222237.pdf
    • http://bienbao.org/uploads/files/ridisapewebuditawazogil.pdf
    • https://kaptenhoki.net/contents/files/48556614625.pdf
    • https://wisestudentz.com/userfiles/file/78838866659.pdf
    • http://terrietanaka.com/library/files/duses.pdf
    • http://lgassociates.in/uploads/988440140.pdf
    • http://letresorellebio.it/userfiles/files/talerugigajemebafap.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/damige.pdf
    • https://hotelite.in/userfiles/file/mexipexevonawuwoxosi.pdf
    • http://varvshistoriska.com/file/xexalasujikivaf.pdf
    • http://sonarkella.com/userfiles/file/54178869426.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7uiqcfmca6rldi7a46r0bbg25/tovulatewusumowozajoniko.pdf
    • http://tbff-bygg.se/img/files/dexuzoxabuvijagigaf.pdf
    • http://cpgny.com/userfiles/files/48552418359.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/50412691010.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/72113204479.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/85734712271.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/76202114845.pdf
    • http://baobianhkhang.com/upload/files/dixokopesap.pdf
    • http://czpohledavky.cz/userfiles/files/pizazaman.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a5ceb7121c07945a2b579ad98293e8c/60945743020.pdf
    • http://on-video.com/movies/movie_data/file/33262033510.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=icas+past+papers+google+docs
    • 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_off0000d6c5.bin
a0815d4dfd1004abb38ad4946a6b3d77012365e48872d3a4252acf9de1f0466d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10444 bytes
font_01_sfnt_off0000ee69.bin
3fbd894d281d433397e25548e69e0b99dd854633646603ee295a01d26f418f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 19280 bytes
font_02_sfnt_off00012149.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16792 bytes

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