Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f39da60749947d8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 10:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee5917a3c8c28d8676b50c6a1dfb3695 SHA-1: e9d017405bcad7ebe993d6731c0c2f9dc61bc8a7 SHA-256: 7f39da60749947d8f9896af926359f613a535f713b73aa86c643759244a5c46f
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, many pointing to domains that host PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, characteristic of phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://tecsun-moscow.ru/docs/file/16236944206.pdf In PDF document text
    • https://sausalito.com/wysiwygfiles/file/93194835685.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zelibolujusigi.pdfIn PDF document text
    • http://chinalabware.es/d/files/vaxawox.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/22332555095.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/nulipofikupuxirojuse.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/40780452626.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/86225288240.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/zodimi.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/zekalad.pdfIn PDF document text
    • http://fteq.ru/files/file/81600741392.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/durodenixefiwoza.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pemebujejimaduxefu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/23668708535.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/likezosadajiv.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/78412606332.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/sivilefog.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a253cca1ac---nufalulixosidurex.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/2591264740.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/82321238611.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/12803505684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=super+real+mahjong+androidPDF link annotation
    • 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_off0000ad4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4E 14372 bytes
SHA-256: bb2f6da7d85caf8151394ad7d08b742016a9a552bf68d513e1cf334cb25dd571
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10876 bytes
SHA-256: 6304f97aae73f488ffb2c7246ea3123b88591f8aef1373198d22a0f77cc90de7

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