Malicious PDF — malware analysis report

Static analysis result for SHA-256 b021f72cdc2de3e1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 16:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf20fc4cbca161ce47f7c6637677b866 SHA-1: e15d7b64317c8734cad1578c891ac505668279a4 SHA-256: b021f72cdc2de3e160bd60e582f36b42290a13fb0fa2b5a970c3d7551036124f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://turdv.ru/SITE/files/editor/file/94234044490.pdf In PDF document text
    • http://www.fashiongale.ro/userfiles/files/tosog.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/pebifederuwarixejapu.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/7777386034.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/pesaso.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/vofer.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/gorilazanovuwutajewu.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/91685433853.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dalupuvitesakodoxetalimi.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zexajuxos.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/sunaguwifudatosidegeko.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/tipowenavopenixexape.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/22902123756.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/65955111940.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/woxatu.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/60212368416.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/53526531953.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/72468777976.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kekekuriduwanul.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkkmnu16reumtn73u3q2sjjo1q/vefoluxefuba.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/44933634850.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/42066617137.pdfIn PDF document text
    • https://temahr.hr/files/81243216783.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/711323387.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/supasepezerelamev.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/38337360593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=does+playing+games+use+data+on+androidPDF 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_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 17448 bytes
SHA-256: ca796bea32f579e59bd0fdb00cfcf61fb9f68b008ef1f3fe66e01d5e3e176066
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10952 bytes
SHA-256: 6725950f4a4a3bf0e65485efcb73b787f786200d81f7801c9733a23f3069e409