Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61f18777f2b7439…

MALICIOUS

PDF

104.5 KB Created: 2021-10-04 21:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1739c838eb9d564e4952f6885eef96e SHA-1: 63423290b65386cf370bb3885629b64e3cb5a5f3 SHA-256: d61f18777f2b743945bd0dfe726c15f4cfcb9c960eea3eeb26577ab8d09782ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spamming campaign, likely aiming to redirect users to malicious sites. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=all+time+international+top+scorers PDF link annotation
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/71968384370.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xosanevurapulilosajiwal.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/vavit.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bbc142e0eb15d80d505d114321acb78a/dixuwiseveranuxebufive.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/rexavo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161378532a54eb---48184210246.pdfIn PDF document text
    • http://sivam.pl/files/file/40336528749.pdfIn PDF document text
    • http://jvmont.eu/userfiles/file/monimadojegidinororuw.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/wividulafek.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/32407224927.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/84125074939.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wokilovepajatuzipepuvonox.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/gobajovowifutapemefimagu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a1f76e3fd44e48787ca234dd42efe15f/gumetefafirineb.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/26929560295.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/57192987983.pdfIn PDF document text
    • https://10fci.org/userfiles/file/89322825670.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/41303714357.pdfIn PDF document text
    • http://dsraxys.com/uploads/tuwubotidetexo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/xesuravowawajuludulesaw.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/14266227791.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/piwoliloxor.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_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 22104 bytes
SHA-256: 8270e5ad83b62998f621c891fcf20fc55417eb0d95731d737218da0ef1081b3c
font_01_sfnt_off0001644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C61 10516 bytes
SHA-256: 50702b03e43aa236e64afce688fa7aaad68cbf452c1f42e5bda577d14e6e4a34

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