Malicious PDF — malware analysis report

Static analysis result for SHA-256 da12c3c4cf2ed0be…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 21:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 859c14c07ee23b7785ea284d1b392af9 SHA-1: 4e3971d7fc4853b1900e102b8a4e49054057863c SHA-256: da12c3c4cf2ed0be7ba93894db82243309c77b9f64856ca4265359badd2a1d64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm designed to host numerous PDFs on disposable domains, suggesting a phishing or malware distribution scheme. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections further confirms its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.libroparlatolions.it/backoffice/ckfinder/userfiles/files/99998018321.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e1232a41---nofukamiw.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210917/file/16319022146767.pdf
    • https://fentesmakina.com/paket/upload/files/fojiridobobetufala.pdf
    • http://www.primariasantana.ro/uploads/file/puwolejegigejodu.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/bufosaberokebaxozol.pdf
    • http://bfttacg.marketsearching.com/upload/files/92389374190.pdf
    • https://zoorichi.com/temp/fckeditor/file/jibosuraboxani.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/latizigejezuve.pdf
    • http://dynamic1984.com/user_file/file/tixepufufaxabafofozuriza.pdf
    • https://balaji-technology.com/userfiles/file/wukigupumulufugena.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/74916793581.pdf
    • http://shiinamotors.com/js/upload/files/50231334964.pdf
    • http://harmonie-avion.fr/actualite/files/77436930329.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/pasenexuwazora.pdf
    • http://bctlorraine.org/userfiles/file/zabisatilenusuf.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/lexapaxumugemoja.pdf
    • https://echipamente-scule.ro/userfiles/file/27157051367.pdf
    • http://rentbucharest.net/images/userfiles/35533189910.pdf
    • http://adidravidar.com/ckfinder/userfiles/files/redixavesedudefexebem.pdf
    • https://aymfly.com/aym_image/files/54858848522.pdf
    • http://inimtrento.it/userfiles/files/40840506834.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/658658782.pdf
    • http://horvathortho.hu/tmp/dixusovovoxapum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bandit+queen+full+movie+download+720p
    • http://tes-sys.com/uploads/ckfinder/files/20210909/16311900935520.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_off0000b57f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 16792 bytes
font_01_sfnt_off0000cd96.bin
b7e5cfe6b7d920cc94de147c2311290a3476ce29a1c50023a42d47b0c7053dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 11132 bytes
font_02_sfnt_off0000e777.bin
14d8758a0faf2cbf726a90880cc89289fd2b6467bdfa76c2aef0d148776aa164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16660 bytes

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