Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f5ef956604a262…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 10:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8cb132ff2d10cfd3ab8fe174538fc277 SHA-1: 5c35d6cb5dbcb8ba5c8a61d3b90d2fd12b2daaa2 SHA-256: d7f5ef956604a2624b947a869bd567884e7b7276b043e74d12a94764c19b5e45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=story+saver+mod+apk PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/nimuxuve.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/minenixaxe.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/87483569917.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/37379507153.pdfIn PDF document text
    • http://viettruss.com/upload/file/fuzuwajerunomipojupaj.pdfIn PDF document text
    • http://bakoca.hu/files/file/rorelofadunam.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/kogusawoxigaxetafu.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/tolavobakori.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d1dc5709ed0a4b84ccf49ee45d26e46/ravugajisujutikowebag.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909175403_4urkk3.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/83961376202.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62940099695.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/27010391402.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/xajigakafo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa0e2d64ae4464a4132fdc7d6e03f652/58148938999.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/gidobepomesijomadokitodob.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zifinipapaze.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/wosak.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/todinugoso.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/35216406998.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/94567333532.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/takadedigutazamivago.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10656 bytes
SHA-256: 342ba95651fb995b4eac8f6203fa5c81b8b72c800c134fa4ebf4f5578e575f7b
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 19780 bytes
SHA-256: 939a88a045474245732dca117e22117116818517b0884733439d81e13c0d7ac3
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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