Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62aa425d2ebfd03…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 02:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a15895c9a29e77895abbb37ca020b7e SHA-1: 47f76785d2bfca28b988c7f7a9dbdff02389b1e4 SHA-256: f62aa425d2ebfd03a9df1726b890331ff65af7d1a9babf16afcfbcbb9721427c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded links, many pointing to disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://daonshop.com/files/fckeditor/file/zuvefetazafusubupurufas.pdf
    • https://portalbime.com/UploadedFiles/New/file/38638241217.pdf
    • http://seteo-dechets.com/images/file/kawugozolarozopa.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/xujavelepoj.pdf
    • https://chambres-lannion.fr/userfiles/file/18175068109.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/xufuduluvowuribil.pdf
    • http://techscreening.com/userfiles/files/84478700850.pdf
    • https://szallas-karpatalja.net/upload/22390165637.pdf
    • http://rollfactorytogo.com/uploads/files/10020979556.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/zoraxazovusagibager.pdf
    • http://na-bytecek.cz/UserFiles/File/3247537171.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69317414479.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/72237139227.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/40141531238.pdf
    • https://pgp-puh.hr/fck_media/file/zatosap.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/52842926936.pdf
    • http://olympicthesportshop.in/uploads/dopisake.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/21825863978.pdf
    • http://sudeoksa.net/userfiles/file/20210914181916.pdf
    • http://tzsunup.com/upload/bexasitubomutavawax.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210903_66EC0833034402DA.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/18429372638.pdf
    • http://icbiz.ru/userfiles/file/67453376465.pdf
    • http://kleiberit.ru/files/file/disuwomumezemisosuno.pdf
    • http://noithatsah.com/webroot/img/files/jusarolituwadovewedinar.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2f40dd5b794bb57e05b1e67c9193f316/sadomotitusoveva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=danger+survival+zombie+war+mod+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_off0000b255.bin
91f32eff677b0423f820e914f79162f37475fb832bdc71e4bec9c174c5091578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 11180 bytes
font_01_sfnt_off0000cc16.bin
72fa5339003e73ccf8ea83c87debdb4685b1b6b6a5eaec76b8bc91891f3eb121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16748 bytes
font_02_sfnt_off0000f69d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16792 bytes

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