Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cb16aba99b87c3…

MALICIOUS

PDF

98.3 KB Created: 2021-09-18 17:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3687832c0bf077d64f8263e8b424fd7 SHA-1: 0df775a7579da0c60585dbd79c84d45ff390e0a9 SHA-256: 78cb16aba99b87c3251addeef569b6eec49e4346c34cb6b552c1e139a6fe12cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://hiniceshine.com/upload/67406088777.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/17535440847.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/14733917685.pdf
    • https://anmoul.com/userfiles/file/laligitimojikoluke.pdf
    • http://citygclub.com/ckupload/files/lotakeroxemeda.pdf
    • http://tv-kitchen.ru/files/files/79408334569.pdf
    • http://computerdoki.hu/user/file/lumedasudi.pdf
    • http://unityproductions.com/upload/files/42260456969.pdf
    • http://tnslib.net/userfiles/files/84812174616.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/60625283348.pdf
    • https://e-ceramika.pl/userfiles/file/sadufuzivalukitetotafaloz.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/74817168136.pdf
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jozibeto.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/15014186187.pdf
    • https://wildarium.com/ckfinder/userfiles/files/gefarawamod.pdf
    • http://le-nora.com/userfiles/file/daganilob.pdf
    • http://cementfeet.com/userfiles/file/93444424912.pdf
    • http://eventechsite.com/files/files/vifagunu.pdf
    • https://cafesca.info/ckfinder/userfiles/files/71106056751.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8c3369f75cf0a528df2f77883e0db15f/42589976405.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/58198169893.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/gufosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentals+of+compressible+fluid+dynamics
    • 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_off00011bfe.bin
2e280e6e1b2d3269678200a08fc8a4f82c68271649c00b4efb47d5d1adc7fe62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 17844 bytes
font_01_sfnt_off000149e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 16792 bytes
font_02_sfnt_off000161fe.bin
67215310417b758aa552918c48f58ccbd88a38acfb7db44902af56f35aae7e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161FE 11112 bytes

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