Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff8645e2f50116…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 00:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ba330622c58945ac3302aad516bc5e7c SHA-1: ad94a10f585bb21f55c89ecb32a2ad5b7ab61542 SHA-256: efff8645e2f50116bab604c7d2eb003762a6c4edad7cc05edcc4e6006e7b7fd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://iqmuseum.mn/uploads/files/74153971868.pdf In PDF document text
    • https://nordavril.com/userfiles/file/60187996369.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b232fea8814dc07c3063cef806659ed5/miwipivero.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/75952371127.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/17832173408.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xetonolemuribusinef.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/nufovus.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/metiju.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/47797741237.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904164930.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jm1o5kefl71qvs0qjrv1s9o1p4/tetowodasoj.pdfIn PDF document text
    • http://zerosquareonline.com/file/davoxosonopux.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/79429287652.pdfIn PDF document text
    • http://live-net.it/file/39801978061.pdfIn PDF document text
    • http://idroter.org/userfiles/files/6376917176.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/39303355378.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/67789476520.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/96720610872.pdfIn PDF document text
    • http://chpcentre.com/files/file/xifaxonipulidapazapiwezet.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46997224324.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fekapixafineb.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090120523370554.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/naruzugudaj.pdfIn PDF document text
    • http://stringladies.cz/userfiles/69731812939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamil+reading+comprehension+pdfPDF 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_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 19484 bytes
SHA-256: d7c5ca7426fb86e9332cd349aa93661e24528ff8b68556d0ffc003f6fea7f13f
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10932 bytes
SHA-256: 6551f86f2c1c7591c60bc52662a0613c0f80e7b3a21eb6a177692f70726913d8
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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