Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa73e61db563f96…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 14:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61797b73448a76f18d1feb127613da7b SHA-1: 1eabc7048b64c927867dc682529634ddc47ad2ff SHA-256: eaa73e61db563f96f6fbc953d77942a09386d166d528a2a0ee17bc8354042df1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cathugo.de/res/wysiwyg/file/41798514417.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vv7ga3c46m37vsi59hd2q8t7a3/wuvosuxegikogulamodu.pdf
    • https://nnkcreations.com/userfiles/file/32179064304.pdf
    • http://misr-consult.com/userfiles/file/26342572719.pdf
    • http://plise.org/userfiles/file/ronijufa.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/50935674010.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210905140731.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/linelejomiwofaxova.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92094150c---87591018762.pdf
    • https://samavetpharm.com/userfiles/files/feduximadatudebumutox.pdf
    • https://maviet.vn/upload/files/wufofurasujuvut.pdf
    • http://hrudolf.com/userfiles/60361567964.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/4412440081.pdf
    • http://screen.by/images/file/29548143406.pdf
    • http://clingac.es/d/files/34833524640.pdf
    • https://gastriklandsbf.se/UserFiles/files/45507942605.pdf
    • http://mp-journal.com/media/file/191126209.pdf
    • http://packagingandfoodmachinary.com/userfiles/file/dobekedojovagol.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/90716156212.pdf
    • http://dansungsala.com/uploads/files/busobigisanivixoxalitev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=netcut+android+apk
    • 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_off0000b271.bin
1cc0dc18b91a385019384dc7791e6579c40815f55f636cf4a57d9b653af5216c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 16784 bytes
font_01_sfnt_off0000dd91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
font_02_sfnt_off0000f5a8.bin
d17a567100a5acf5a9c87496d94d5e054c72ad8f3f1e8ec1300a92f270a81498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 10460 bytes

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