Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ff2e3f03c09048…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 13:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 232e08e7373782390fbc3275f38a5c0d SHA-1: dd2991c9efe5729a215132574d764b999eded8d1 SHA-256: d8ff2e3f03c09048824fa1de6219c9dbe9cfeb4444becc480e4de3f00687a572
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for malicious PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bsp-oblspl.org/ckfinder/userfiles/files/9840238646.pdf
    • https://lanegarrett.net/userfiles/file/44782496513.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/72689502570.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/nogapupudepixewakere.pdf
    • http://www.fuchingrading.com/upload/file/kagilexixanuwozoko.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/27624644619.pdf
    • https://moolans.com/uploads/files/romaxak.pdf
    • https://isabellepieman.com/userfiles/file/12240609774.pdf
    • https://bwawarszawa.pl/upload/file/zivajexowomadaxag.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c10bed51---todidawedimuba.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5cc0b6e7.pdf
    • http://qualityspices.in/ckuploads/files/jojizasivetuloxixenugo.pdf
    • http://gasasosong.com/upload/fckeditor/file/fawojapepelubuxiz.pdf
    • http://heninrealty.com/userfiles/files/kiporugidowejobifaro.pdf
    • http://defhjdr.friend-match.com/upload/files/kimuroxudumijutena.pdf
    • http://kimhoatra.com/upload/fckimagesfile/24333945817.pdf
    • https://restaurant-kamkok.fr/img/Data/file/fisuwoxipelofaterumew.pdf
    • http://polyacer-ecp.com/userfiles/files/20210906_191801.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/26236073971.pdf
    • https://ppntassone.it/dati/upload/file/fazasibude.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/61157379544.pdf
    • http://aylincinarli.com/fckfiles/file/didosimizarenifofiniwo.pdf
    • http://mmckno2010.zkosuchdol.info/files/xasijovone.pdf
    • http://archbot.pl/files/file/60745919856.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesuzazi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+send+pictures+on+facebook+messenger+android
    • 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_off0000e344.bin
d138d6996c8e6e6ae9169c3ed59c0fee8f4006dd4fd828f6451475465ea098ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 11324 bytes
font_01_sfnt_off0000fd87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16792 bytes
font_02_sfnt_off00011599.bin
dbd77db1f9f6bb3abc544b18931c97e11566fa63c7ecf50d9dcb14eb2240fc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 19784 bytes

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