Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bedb2bf87d4e69…

MALICIOUS

PDF

96.4 KB Created: 2021-09-24 11:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 390dc8e03b3d8d53388fdff0d9436fb0 SHA-1: 71cb1e02185961624b479edd552f73104ad33017 SHA-256: 18bedb2bf87d4e6925ce6f20f892d44e047c35c13b523ca1979886b6e4db4d20
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jkmart.net/FCKFiles/File/9109635013.pdf In PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/jizikopikopasafuk.pdfIn PDF document text
    • https://nomortiga.com/contents/files/83058628640.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/lemumutanob.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/sajazameripuxu.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/kuregexurerogisuduwoj.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jodokijuburunewumuxeb.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e7nbhkbhp0m3jgo9urb75siepi/15433445947.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/1742804230.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/26171407119.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/41817651316.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/foxaxudugagi.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/juvovemisimetepanajine.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a0f4e4446---7725568452.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/17764630613.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/60834110461.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/lutevosotudasimekinoxuzif.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/mevidizusabilobovo.pdfIn PDF document text
    • https://2winit.com/Files/files/57195188801.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/vamubewago.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/56619809011.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/gejefituno.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/magumekenugoxigumavokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modelos+de+diagn%C3%B3stico+organizacional+pdfPDF link annotation
    • 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_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 19212 bytes
SHA-256: 8fa727ddea79893ac6f05c61f9bea67dc4dcd32067a63706752e71d4e72c0fcb
font_01_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 10984 bytes
SHA-256: 2599801bfd8c163ba0eea8024d3878bcfbc1e8aae12924a21fd12d63ffcfcf4c
font_02_sfnt_off000158f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1