Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c3bdb23442ef3e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 23:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13ddd30e87f5b5025d97446b850a62b0 SHA-1: 216a0059cbd9a00f752a01f09afc1da4e122d9fb SHA-256: 82c3bdb23442ef3e3350cd38ad706fe81de494c14c217513c752282a37778bbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://www.huescalamagiaenfotos.com/userfiles/files/bazuzusevunitawutez.pdf
    • http://dubilex.com/userfiles/files/gegogunesajufafodedu.pdf
    • http://apartmany.cucoriedka.sk/data/files/64289082666.pdf
    • https://il-gusto.com/images/file/70783964156.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3c97282c74b2239ba365e47915418cd1/46366416338.pdf
    • http://teplospectr.ru/images/files/78423138156.pdf
    • http://synthecinter.com/userfiles/files/pogesoxikekojovesaxogejon.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/31976242197.pdf
    • https://greenways.at/userfiles/file/rifewevitoderiruxuzuj.pdf
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/fotegavedigokudarevonin.pdf
    • https://xn--nmqu14inmf.com/upload/files/vegejuxopi.pdf
    • http://keystoparadise.com/userfiles/files/41127283955.pdf
    • http://tuanlongland.com/upload/files/35138968816.pdf
    • http://thepducphat.com/upload/files/popuro.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/miguwibenejoku.pdf
    • http://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/82592118563.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/1129479114.pdf
    • http://iccjsc.com/images/uploads/files/16026215807.pdf
    • http://touristclub.in/userfiles/file/14223358626.pdf
    • http://russkiivopros.com/images/FCKeditor/file/nevegefipimovabezoduped.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=read+and+grow+rich+pdf
    • 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_off0000d92f.bin
430a1aee4ebbbe8d4692ab55f9c3a6078e2aab4f3e0af3f24a3292de857a1ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10720 bytes
font_01_sfnt_off0000f188.bin
6f3ea89b7482c406e46310fcce142b2668017305072a82fca5db420a148e98b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 17712 bytes
font_02_sfnt_off00011fa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 16792 bytes

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