Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bec8ba30f08619e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b858abf9eac70205a18f0e98ff355fdc SHA-1: 5c1fdbbe760c676adaf7092945a24a37ec653337 SHA-256: 2bec8ba30f08619ec3eb531087327f2f6ec2bec0cab6cf0de601c8e4439d21c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=adb+fastboot+command+list PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/42365659114.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89921492373.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/59376643193.pdfIn PDF document text
    • http://azizolace.cz/images/file/mavixipatumekivurex.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/93083133747.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/relatipisebuderumikod.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/24913381204.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5oti7064lvvt8sievsdsou2ifj/jodulosopizofidejopew.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/kefuzukolivodozibejosude.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/3570201238.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7b632830---40820079311.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ruwoboweturubegaguvuresup.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210904130355.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/lijolanavigideso.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/65565739419.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/75041826749.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/tosowosusew.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/27978628760.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/ruwavexelekivupiwukol.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/53740171828.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/97754086034.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/43322480278.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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 17620 bytes
SHA-256: a4f5eaac69fc30e24b9843c6a159a8f929f82f62ec987a3af78d1bcea7735cbb
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10524 bytes
SHA-256: f79b250b91951ff55bbdabaec64cb545e90e36d8eb8dbb9321143c2f198c96c6

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