Malicious PDF — malware analysis report

Static analysis result for SHA-256 51574bbd095046d1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 20:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 411fa7de1b7d9ef352d74edd93ab2464 SHA-1: fad5788233d0c676992cda7daee74368f71feb8c SHA-256: 51574bbd095046d188523d79a9f9d4e19741ca51e15c8aa7fd9814ee9a2b32e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=solve+for+the+roots+by+completing+the+square PDF link annotation
    • http://rainhouse.kr/data/editor/file/46440460561427a30238ee.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/98039796396.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/oq5hml6ugvk2p4mkboqkdgpdqn/18387200748.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/5276197804.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/rexakowapesin.pdfIn PDF document text
    • http://compsult.net/userfiles/file/moleromet.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/21776782105.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/76670632583.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/wunenelerasibanuf.pdfIn PDF document text
    • http://ha-sine.com/d/files/81167856930.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/96139750189.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/sotudugonojitorasafesav.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/83297562417.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/8151445223.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wanofexejired.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/sawivutatozunufafugorako.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/55033252988.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/ruguvo.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/57139847408.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/80040611539.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/ketugutafolilaka.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/sotivebezikore.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vutinepesotov.pdfIn PDF document text
    • http://kezmosas.hu/files/file/tenufapanaruxipono.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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 18100 bytes
SHA-256: c6bde4e7bea3dcb65e91cf714083b186acd3a99ec87b3e8cbf28b50338e54768
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 11568 bytes
SHA-256: 41551a25d382b47024d48bab8de7a4b28dba435cef88b1d99110f86b1af5909a
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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