Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a4265ecce3ba94…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 07:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 950fb8fe03bd142af6808e0e707246ac SHA-1: c363d72f7e33a616cf5679f3d40827e3b5ae7dd6 SHA-256: 91a4265ecce3ba9488d2d23c94601f489e22c30c166802b98ee7fe54cf14bbae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=yuuki+asuna+anime PDF link annotation
    • http://m-styleauto.com/js/upload/files/80915092012.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41816167596.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/31130564079.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fonuxovi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xujemogezili.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/48532888858.pdfIn PDF document text
    • https://aildf.in/userfiles/file/gaxipipibufebaru.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d4776c2d---binapus.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/31684422300.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210916210231.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/10398771473.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/68496331152.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/87907045738.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vosegibu.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fujagelos.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904101358.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/21054932867.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/pavopedadevisevowovebu.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wawasigakuzofidurofulinax.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/57578510177.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410b6a7078a---fupepixip.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/81264216979.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/94741855319.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/39913887636.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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 16984 bytes
SHA-256: 6774eda55d1d90273f99133ba20ff8d2a8b206649f905245654c72333be6e819
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 10080 bytes
SHA-256: a275fbc4707a4119f0105b286b786fbc1c1ab114dbfb84b90ed58d4b3bd5ad44

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