Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a9d78721e96b9c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 16:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e942779ece6e2dbc0bb18cf7f0eb5ac6 SHA-1: db978f9e57547f2ca953fe6a705a96ee882bfd6e SHA-256: a2a9d78721e96b9c7bd9395ff0878ccdfe96c717d57f2c6b0b299bd2b30e25a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URLs and the heuristic firing related to a link farm suggest the document is designed to redirect users to external sites, potentially for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=c%2B%2B+primer+5th+edition+free+download PDF link annotation
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161487549c7f53---kozeboxedejirujajid.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/kagedisojev.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e28317ae---20118961400.pdfIn PDF document text
    • http://erimti.com/userfiles/file/zirijobozelidedenalari.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210911105316.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/nitupul.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/84493074263.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vosawibukalurazitikovoril.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/28917372166.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/nubudamakikokunekarivek.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/fosozemipoveluzaribosidup.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kupazanepomo.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/sutizotinewotukejavof.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bebeno.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vezutojisokilitoxepuzo.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912202643.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/kuvexizor.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/79368879222.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xevesodirekofudoxomo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/11612658581.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905180327.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/zimosawifolijenuzori.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_off0000ac0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC423 10848 bytes
SHA-256: d09e5dc2b9b886c935b68e6ce2b047baaba4677941250998c96a15d2d638e89d
font_02_sfnt_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 15364 bytes
SHA-256: 1d60aaed6f0fffe902fed5b5fedb72ce685f50b3a8db6f8819abb4dc8b72d248

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