Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c94c9295360f683…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 19:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05dfcab1f99aa9fc4ee794dcb7e189c5 SHA-1: b03645f6e7131e0964174ef32d4278b4a49cc941 SHA-256: 8c94c9295360f683d2b490b338c51209c8f39df9025ff21fed689545f0e1d405
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDFs hosted on disposable domains, a technique often used in phishing campaigns to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a QR code lure further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://rawoctane.com/uploads/file/bogezuxaxumubo.pdf
    • http://kovospm.cz/fotky/file/nadun.pdf
    • https://exihomes.com/userfiles/files/95387799081.pdf
    • http://acsalma.hu/userfiles/files/katutogitesozo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614481f06e892---semunovogo.pdf
    • http://metamorfozyayincilik.com/userfiles/file/86708123723.pdf
    • https://jamuiboe.com/webroot/upload_media/65147447142.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/28584372156.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95647654022.pdf
    • http://bsinteriordesigner.com/userfiles/files/88050849705.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/78210633703.pdf
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdf
    • http://gtshotel.it/images/file/dalilezigidixojawusug.pdf
    • https://afra24.com/basefile/afra24/files/62478812353.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/reubj041trk8uqripsnuum338n/93458216624.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/38011651069.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/karezat.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/54577002610.pdf
    • https://zohopin.com/calisma2/files/uploads/zopuleluxinuxuj.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/50581546380.pdf
    • http://datacomsystems.cz/userfiles/file/pevavo.pdf
    • http://theclelandgroup.com/img/upload/file/lowofilepamukil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stream+android+to+ps4+media+player
    • 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_off0000e248.bin
4b95542a934de07d9cbef4358a33b6c568ae7504a9b39818f76dc8e99e1bdba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 10820 bytes
font_01_sfnt_off0000fb39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
font_02_sfnt_off0001134b.bin
e112cc28eceb0f12b7b5d5476cfd1443484ddf5914d32d4580f18db35d5fcfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 17216 bytes

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