Malicious PDF — malware analysis report

Static analysis result for SHA-256 b646584b4c1fb835…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 22:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3d7c130f9da6fb01790864a1cd9547b SHA-1: 58887ecd4ed10e343c049578e22f6260c51ac1d6 SHA-256: b646584b4c1fb8355a0e88a61613feebb5062593d0997dbb726f05bf8382e7a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jjw-led.com/userfiles/file/17143430730.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/fagexeresaz.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/zalud.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/82389844904.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tiseregedubujiguxokuf.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/85740502171.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wukarupe.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/10324855455.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/pofixuxenokiken.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/54976151504.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/95247988058.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44636172723.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/fadumujada.pdfIn PDF document text
    • http://torgoborud.org/images/file/73935445805.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gunisematezap.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea47a76cf---75409443567.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354de99d0e4---novapax.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/godojivagunigun.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/28072714180.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/retamusimiro.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14179035490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+online+xls+to+pdf+converterPDF 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 16136 bytes
SHA-256: f5b56242148039fbf798853cfd8e040ee7f8eeac329ad19adf5829400e9baca5
font_01_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10596 bytes
SHA-256: 12a5e991c71f7141165cf8f49272338827e1af52d118cae5c4b77cf480517880
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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