Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdcfae8dc58ec0e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 03:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 658469fe2a0abbe68328a4a05b0c64ee SHA-1: c4a6df454e866cb4568ac5bea210ca229f0edb3a SHA-256: dcdcfae8dc58ec0ec8f9455d9a0f0766db12194d73c3f2bfbb915787884eb75d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=best+hacker+theme+for+android PDF link annotation
    • https://nenmongdangquang.com/upload/files/5792544134.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0824b5cb40893339bd8aedc70afc7bb4/97855698943.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/83231890057.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/pizob.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/getegarup.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/46950183118.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kagovo.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/mositepamivufetu.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/lesazebasijudirodifo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/37463577835.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907020014.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/mewemepubusesepifono.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/pufikaxeja.pdfIn PDF document text
    • https://websbag.com/uploads/files/67885243589.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090406455481.pdfIn PDF document text
    • http://topp.pl/_topp/file/pudagubos.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/91463935346.pdfIn PDF document text
    • http://sbcnepal.com/images/file/66630759769.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161383b6829221---85353368112.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/24837554407.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/losusuragawanuvex.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/46231592935.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/98381172218.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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 17364 bytes
SHA-256: 252be56345a5256eac84cad68a7b89e12316f47b0b84a0a32d74a9c89f8825cd
font_01_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 10840 bytes
SHA-256: 08283ec7cc6a7c87bf19789d610047c221e7cb425b3cdc8ca50da9046e794b5f
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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