Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc32d36fc31ab8c8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 17:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e6188436168750c88d9a0d3bb7c502c2 SHA-1: 725d78293c952495ecf3dba0b9a8898f999c59e0 SHA-256: cc32d36fc31ab8c81d1a5cbc8146174a3ca0aa346c2e770bb6da1f8873d0efe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://copingconversations.com/userfiles/file/1480247528.pdf In PDF document text
    • https://lacausedeslivres.com/userfiles/file/78481911373.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/79255549290.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/12506875272.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/87570436382.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/jikovizopiwuxenafed.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/39190290955.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/66940177109.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/bupesurarub.pdfIn PDF document text
    • https://actorconseil.com/files/file/76977152279.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1tq648qmotodvrtjhjr2tdlp5/judunuwow.pdfIn PDF document text
    • http://live-net.it/file/vesaxetufa.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/9822798847.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210913170554.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lerukikor.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/bumonunube.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/46180994209.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/xivulazeradefubutezumupun.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/66489952806.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/9615923482.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/adb483469c55241be1a9f26d533fdd59/wililono.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/76866179657.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zatefovolivuze.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/182109345.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sixizotozadaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=line+download+for+samsungPDF 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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10740 bytes
SHA-256: 40d229a9bc5784e3bd0f9eaaee4b3b9b518541180572030411d7b4ea2784eba3
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 17676 bytes
SHA-256: aea940dc8c196fd5c71866ee649f6808bacac0a48fe8919521371cc3f3d44b4a