Malicious PDF — malware analysis report

Static analysis result for SHA-256 061a37ee2ad51716…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2164e9b0eb3c003c2483e72fc39483b SHA-1: 3e9c60b1461cb6f3c97d9ebed9a4675b94922ef2 SHA-256: 061a37ee2ad51716b7ef31e7f46bb0513e46f93ff43b1859d4cef2aca43a0a6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to direct users to potentially unwanted or malicious software downloads, disguised as legitimate content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=download+farm+frenzy+2+mod+apk PDF link annotation
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zilunaxap.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/35548734722.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xuparidulotefotevupivazef.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/67791325821.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/94362561302.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/25116989287.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/9974138195.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad9e9d10---dulogufilegekeweki.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/4830739466.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d75723a3---giduripogiruwedofevax.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wunesowibafesepamov.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/63128803423.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/20258723524.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/31807795657.pdfIn PDF document text
    • https://matratva.in/userfiles/file/1924667974.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/posexusidotokin.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wijoferasibigu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/44465435579.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/refelikebutajuleves.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/petizobo.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19262308081.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/sisarewujukuwi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/rabixewajamajenofe.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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10776 bytes
SHA-256: cc4ea58ce4f9fe3ee5fb75a362e5e8136ea5d0a4a7f3efee0aae14eb7665bb74
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 20880 bytes
SHA-256: 3e1f0a9f0bc1b986287dca01df95ee172e848755fcc47b0bd0da080136dec08e