Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b33c6ca48a6ba3c…

MALICIOUS

PDF

95.0 KB Created: 2021-09-16 13:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1997d5fb7cd114a1bb04fcd59c976c1d SHA-1: 895e1678b11a85cf056533239b87970f6eedf404 SHA-256: 7b33c6ca48a6ba3c52cd9632e7b34dbfaa32deabab9d51b201868bb4705a7b81
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=breaking+dawn+pdf+edward PDF link annotation
    • http://elai.kz/upload/2021/09files/210908045045304565ebbhk.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/fonibulonojexunurofiloref.pdfIn PDF document text
    • https://cargobull.cz/res/file/fetuxolikuzojiginuwoxeli.pdfIn PDF document text
    • http://cycling-software.com/files/file/96451300976.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/92336811272.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/38570250128.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/varekivufubedipufiwiledul.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/64318463021.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/39064358854.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161307674a1082---nevazumufop.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/79489485220.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904020324300.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/35102465474.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/83250989405.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/durusepani.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5eb5b39b---gatobiwu.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/suzamanirotix.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/13966242901.pdfIn PDF document text
    • https://lapakunited.com/contents/files/32479661244.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/faxazikilabivurawefaladi.pdfIn PDF document text
    • http://preiss.at/upload_files/files/4044968209.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/31287915027.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jejevivonobukofisuzezok.pdfIn PDF document text
    • http://limoride.net/gallery/file/fewawinupifituzuvefeneg.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_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 10472 bytes
SHA-256: 243a688a05fdab051ac0eb71278133e3b1fb35f6063aa8bf94f0662e9eef1b37
font_01_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 18544 bytes
SHA-256: b98c174ddd9232b7bbc18154e39921248df64f90f9ee3115f642ded56b93f47f
font_02_sfnt_off00015654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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