Malicious PDF — malware analysis report

Static analysis result for SHA-256 feec8d5e6c032204…

MALICIOUS

PDF

97.1 KB Created: 2021-09-10 06:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b862f6d90c2f424937dde92049c2226 SHA-1: 3dbd9095aa82867cca9a2f1bee111c456b64b2f9 SHA-256: feec8d5e6c0322046e266b751f937be974db9cfd86bc6f5adc841f1804263004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crysiq.ru/uplcv?utm_term=homo+deus+yuval+noah+harari+pdf PDF link annotation
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/tesivunutesi.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/jorul.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/45314433877.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4s9i784ljc1ks2btukqr6pela3/suvenuru.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/43909286857.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/setozuvoxewagodimamedirex.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/42593763567.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pikitule.pdfIn PDF document text
    • https://biomisszio.hu/tmp/fifof.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65300027601.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vizajagorokasafu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kalunekofebisomoti.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/kudadekisazuximube.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/96384193422.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/kirisebalekojadiberab.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/terav.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/47340647814.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/wivitosulevato.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/titubusamesogafoj.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gusuxukidipipofamagijab.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/57917902381.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/4752678686.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_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 10936 bytes
SHA-256: 444088891f89fa84d9b71b669b0a610226695cd8a34b04f134a395c0a0ad209c
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 19920 bytes
SHA-256: b71865c30eb4f918949a802eeb9ee86bba8c44e4d3d5bc050b7009772484f5e3

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