Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5f626d80e423bc…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 18:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb1517847ed9eeb78b7661d6c0d24085 SHA-1: db4e4dc97a81d35b9660dda86a7906dfeac4d38a SHA-256: bc5f626d80e423bc6b3294491f0ce5d68b3d2a4c979db70d32b8bc107c55edc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. Numerous external URLs were extracted, many of which appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to the T1059.007 (JavaScript) technique, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=non+stop+mappila+songs+mp3+free+download
    • http://jeanchapleau.com/userfiles/file/nojimifodidavaxagejom.pdf
    • https://praktijkbinnenstad.nl/file/45230679604.pdf
    • http://chemonova.com/FCKeditor/file/suveropabipuwarokinere.pdf
    • https://youxsoft.com/uploads/files/vukarazupupagerozupot.pdf
    • http://iwilldoit.ru/uploads/files/files/dinakiwanabamixiru.pdf
    • http://rracc.com/file_media/file_image/file/kuzixavapenitu.pdf
    • http://3sdent.com/upload/files/lojetufoduwide.pdf
    • http://sireny.net/share/files/japofiminikidugafuzebezi.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/gabikezivibexorusaxitoli.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109230448191222.pdf
    • https://pavillonwohlen.ch/userfiles/files/21283601931.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/77917076740.pdf
    • https://vanphongphamhienluong.com/upload/files/99781690140.pdf
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lifuvomonenofofitilixugik.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6612fb61aebf17ef68fb8775edd15ab4/15643356921.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rufajapakabemo.pdf
    • http://pazzo.jp/js/upload/files/zebukavesiwevigin.pdf
    • http://tcihk.com/userfiles/gexironew.pdf
    • http://csc0898.com/userfiles/file/20210903035615_9ha73t.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/1534402926.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/guvirejisukekixezomi.pdf
    • https://vetregistr.com/ckfinder/userfiles/files/55445491513.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_off0000b1fd.bin
d3dab9f45b68847e2f3709074a705f54191dcbe24680e3f79a1d066226167405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FD 11076 bytes
font_01_sfnt_off0000cbaf.bin
4d8f1e8d406b9e354225659383655559589e676aada8d6c9998f0fd233d83e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 16504 bytes
font_02_sfnt_off0000f569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.