Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f993a74f7e6a2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 13:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0e08dec9b549cb4c2609e898e3fb349 SHA-1: 4179f1de9e7de464cdc018b020c6aba77bc09a38 SHA-256: a85f993a74f7e6a28e9b17ea8e274c819675d096d89692f3e646cc803970a36d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using numerous links on disposable hosting, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=torque+pro+dpf+pid PDF link annotation
    • https://betenagro.com/sites/default/files/file/99995698413.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/19247694743.pdfIn PDF document text
    • https://goodline.by/userfiles/file/suwosorosajamopidewukivot.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/basafejunaxuxatafebagasa.pdfIn PDF document text
    • https://aksusu.com/upload/files/7046116654.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/75360017900.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/upq6tnd73kb157rnmb5kekono4/74708536516.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/binakog.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/45422173434.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/merugotoroxoledarogogo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/40599440652.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/luzulasumebejowimaze.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-23/20210923023740324719.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/47398120619.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/rorisegukaxonadedimi.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/94915994847.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210919024829_awrnnn.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/37371941492.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161312ed87d433---36348157642.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/37041740323.pdfIn PDF document text
    • http://venkateshservices.com/uploads/sojaforomekojexujebita.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/poxujize.pdfIn PDF document text
    • https://pcetravel.com/files/file/18654728162.pdfIn PDF document text
    • https://aspirans.com/files/file/17614050877.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109180236137423.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/muzodi.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 10124 bytes
SHA-256: 7a51afe772f59501854c65b72db9bf147e66ba798b9b7c6467a1eaf37eb0d6a9
font_02_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 19876 bytes
SHA-256: 02c984577ddbb2a86f071c3a405c00984e09b02adea583d0d9b59b4557b51fd2