Malicious PDF — malware analysis report

Static analysis result for SHA-256 e184b6dcd2e0f166…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b9772b64f7303c92d70cce4a24010bb SHA-1: 25754b98d688d56c13776fdf1fe91695e4e41a0e SHA-256: e184b6dcd2e0f1663f78d6520ecd80099f601a3803a9f37507f48399229b71f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The embedded JavaScript likely facilitates the redirection or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dolnoslaskialarmsmogowy.pl/imgturysta/files/tenigetodadup.pdf In PDF document text
    • http://machin.kr/userData/board/file/14636116653.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/tofurozonata.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/58172571764.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/losamobitata.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rekowudobopuwawudekufuvor.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/31282820478.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138320af3ce9---virexelogudojil.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/bososanibirinozu.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/xogir.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/tafaxesegenujusor.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/wavafolivizeburojaso.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/jevezufaxuka.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/15355622752.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/6429893222.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lowuxasapiveruzorejame.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/satajoropiremoniloderile.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139886ce31---11574551619.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/zasedetawiserowumoxa.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/16793898566.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/51873481628.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zaxobabigevulagini.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/wozifoxi.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wuwara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=worms+android+apkPDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 19360 bytes
SHA-256: 8bc92c50e6bf3fae12b35c1aefbc50b36486227ad0b4c79857e7158930311fc0
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 10360 bytes
SHA-256: a84c0f05fdfea44f6b3f8b582841d42c54c5ec630b87e0cecd895c5f3304f72a