Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6966c159cfe8502…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 20:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53a3bcb6f02f8c4c475d1a61d21c9814 SHA-1: 93231b491a6ba3c3b9d3ffa27d41ce72eec3ed73 SHA-256: a6966c159cfe8502bdc64700d4c5a7578d9a7632d9c2fcbe61ae771b3fa1e0f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=knights+of+the+old+republic+2+the+sith+lords PDF link annotation
    • http://tgtech-auto.com/userfiles/file/vudenaxadetobakeseje.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/25915674140.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/soxolumubezufikifigo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/nezutosor.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/komonekamixinoxekuzi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5f40e727---vubesuzopedezatunex.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/doxunexaw.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/35429347656.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/42459057646.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/paxakegenifoxoka.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/jibiwivelajikotofojir.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66357354214.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/letexizexilefuneve.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/26883328974.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/kekakud.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nexemokuzugabesagifar.pdfIn PDF document text
    • http://gwynnoak.abwingsmd.com/uploads/files/78088758610.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xilemumuxuribulumudije.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/rotidelawi.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/81649555327.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614caa6183acb---60901744191.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vomemomubagetadidimegurol.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/7157528284.pdfIn PDF document text
    • 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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 17744 bytes
SHA-256: 7505ae6d9a4b257eb37b2b46e2acce1847753b01264e7cd816cee5ef403ebfa2
font_01_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 11088 bytes
SHA-256: c314ab4d1cb2c27a59b7c4135f7a98d9f1344b65b3c54067c4ff61ffca350a51

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