Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99cba7f92cddabf…

MALICIOUS

PDF

95.1 KB Created: 2021-09-17 19:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07eb06392fa8bcbbe033fb00fb7ba5cb SHA-1: 35ead0e50e8077509d2ebe345c887aa7c3b173cb SHA-256: a99cba7f92cddabf494ef2e257208e078a8e4c734a6bff89f848320c21bdaf55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=death+note+novel+pdf PDF link annotation
    • http://1-sanya.com/blog_images/blog_/file/letigalugafamipopalosebi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/38068845942.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/58120267016.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/68907033198.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/83169381071.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/88598389926.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/172903859.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/dabojebabimapiv.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tesegel.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/20530546012.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/40164996607.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4a60c0f1a6321c26593fd60e5e9e493c/75523767345.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/retobod.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gumabokega.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/32612556591.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/8885241454.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/fanirevewomerinedozeveme.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210902112651.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/83749582602.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371d8aceaeb---dakiguz.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_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 18912 bytes
SHA-256: 522d831f606b31fc30797f56e2dae5e929ff295f6a00da6b2bcfbe8eeb019427
font_01_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 10304 bytes
SHA-256: f89c7390e3f8e7b31a7977a46bbfa49529d467f3b0c0422b0490a60e83f87e08
font_02_sfnt_off000156e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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