Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dc12a37b5bf02e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 16:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80dcb7230426dc29722917c4e446709d SHA-1: 3f75efae576819b69a883402c69b8f1eabbe4fa7 SHA-256: 76dc12a37b5bf02ee797fbf3b7d6f3a9faf5eb659a0cc65fb21a7b415b0cd77b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=four+letter+words+beginning+with+b PDF link annotation
    • https://porfic.com/fotos/file/12285441940.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/75750520916.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/ruwonakawigaxida.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/vaselolozi.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/23588951707.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/jubudononavesojutumi.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/43145277627.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138795a77116---rawavabone.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xisututalepijenizadak.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/8373872317.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/posesixubuwidajogati.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-14-04-48-13-Yvr7lOkX.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59492733298.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/derozezajiludot.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/85743443557.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wodoxilabawekul.pdfIn PDF document text
    • http://mopron.ru/upload/files/50698657666.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/18927823117.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/50157318821.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/75181014737.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/wezikazoxuradem.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109190717536859.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/17376939734.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/3646203049.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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 17344 bytes
SHA-256: cf3c988c1fa80bb73eb6df6c80fcc2a66a5714450aaba2b06a484ba97ec5862d
font_02_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10668 bytes
SHA-256: 56f37f8ff8457df61c71e504cd3623922ec90b5110acc1f275bbd38c03cb2e64

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