Malicious PDF — malware analysis report

Static analysis result for SHA-256 499fc808bb89e722…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 05:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1152a34ecfcb16077c39c9026838a607 SHA-1: 96c863018cb90911368fb899ac57d78c0f30aa84 SHA-256: 499fc808bb89e722a3199451c3f3bf5eea2f7eec5e67fc173d2bd9525246ddd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

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://laborke.ru/uplcv?utm_term=how+to+pop+up+messenger+in+android PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/2905269233.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kujafapigojezudu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/54465721927.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gumutoxifixuxopegozesasuv.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/wupetujapuxisadogijoxo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210913191025.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/24949624616.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/porosoxo.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizirobemu.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/2188993148.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/nokazinojowizetezumuna.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/papaxawadamazuxiroj.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/97296269256.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/ligixuvudafud.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/vosalimi.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/gedizonagakemudorizobe.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/73426231165.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/bovanitonejolala.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/nafomerusekesukanawojo.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/nipirutewul.pdfIn PDF document text
    • https://almavilag.hu/files/files/92217174975.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/24022488677.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/lemalataso.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 17024 bytes
SHA-256: 40a58d806c8666f070a85b10a25738faec63d2364edbe76170cb29a6299d18f2
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 10864 bytes
SHA-256: 89bb9968118e309694b5dc7800ba90b3112741ea70ee91759510cf13ee655b44

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