Malicious PDF — malware analysis report

Static analysis result for SHA-256 64345565029c4a48…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 11:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0fafcf6bd7370946b43675d594a8b103 SHA-1: 5bc10f57076ccc70790182941383aabc1750eb1b SHA-256: 64345565029c4a48c103b96cdc12f73c579848945b78d91728ec6bd18ebe51fb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on disposable domains, indicating a link farm strategy. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this, suggesting the primary goal is to redirect users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=quiz+question+on+computer+with+answers PDF link annotation
    • http://www.civilhospitalpalampur.in/img/uploads/files/90864487398.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/48505870481.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/35857689840.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35429725072.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/39668189277.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/26202413779.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/jopulobapalajod.pdfIn PDF document text
    • https://bliznacite.com/files/70679773661.pdfIn PDF document text
    • http://netart.hu/userfiles/file/75476339364.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/jaxiwijetogonota.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc9d80c74---lixisekuposopiranetigas.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911043759.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/60935064458.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/21630660960.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57205947638.pdfIn PDF document text
    • http://weldingplaza.com/files/file/78729698559.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gukojegeviragetajinegepe.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/tarajemulasexakevakufa.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/70384051862.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/93909864091.pdfIn PDF document text
    • https://profm.hu/files/file/97242723306.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/1235269749.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/92873179433.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315c1b29a88---setuwatuxijaxubi.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/naletapufel.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 16172 bytes
SHA-256: 3409634f8aba6a2ea7f2ff3debe2a0c482a30600692525ac3fc15408c4ec500c
font_02_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 11044 bytes
SHA-256: 9b6e6b529ff8438793de1d0b0e0d4949a073faa0bb68b386c9645845a7e0d8c5

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