Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded47c5735adbd44…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 00:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1a0789106488a337a604472a4769db1d SHA-1: c3325d636c70459f72547922ac2fbf3efeed53a7 SHA-256: ded47c5735adbd44fdd60c19ff7df0f7add31d9e0c24a3720498a9afea7ed884
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or malware distribution by directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tianfonmm.com/d/files/56006776834.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/56983085296.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/15896214618.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/54133867654.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/16909714553.pdfIn PDF document text
    • https://proxus.nl/file/jewefenomo.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/pewikudaxo.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/tujiruxugixotidamapa.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/26746132344.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/30763191721.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/86365764128.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/somedumobumovofa.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109100507118391.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/bosotija.pdfPDF link annotation
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/89840873384.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/24182036464.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5ad15cb0---14232290414.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lisuzato.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fififip.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/95801990409.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/14021414101.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rarozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diamond+rush+original+mod+apk+downloadPDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 10888 bytes
SHA-256: 3419aba38fdcc79b7c36a9674fcdad531c57ed82fcdd2a4a58c1f23fed7b30ac
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 17600 bytes
SHA-256: 555b1e419b61c117fe09483c431aa967984fa136c1b797c40da5f83f99ceec2f