Malicious PDF — malware analysis report

Static analysis result for SHA-256 4245d7c1befc2b85…

MALICIOUS

PDF

90.7 KB Created: 2021-10-06 20:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ca9864240a4f4879aaf97df5e7da0a6 SHA-1: 80dc0bb75826320bee947798f7733ca1aeef50f2 SHA-256: 4245d7c1befc2b85c78de7cfaea796053975815cc0a027a539bec16d30dcaa7f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF is designed to host many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=basic+science+mcqs+with+answers PDF link annotation
    • http://pokwuttibut.com/file_media/file_image/file/jamotetizane.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/66750752204.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/dovabolaguzerixolutevumu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/baduwatuzabamasojuf.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/25nkh5jp3qlg6j4v2hc7h67o53/tifid.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/fotunuf.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/2146561887.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/dugitazofeviginubipuf.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/3134461462.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gepifupokimukinizu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fimigakuwofabojuj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446882cd239---13031728460.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/21622930319.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210921204851.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vunofef.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/vodizonebezonulukufarer.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/5792429558.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jikidanu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/291900262589.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/7409112982.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/kijonakutivixufaxaviwixed.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614403f4dc3cd---mumedoditemevoresasoxuti.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fugazikuvadajavapod.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_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10612 bytes
SHA-256: 6a711ee1b003bb14cd00b92416c5688542387ec87c8035f220159cbe9f7b1c46
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 18688 bytes
SHA-256: 5ad09774f7829ab4ca7382f09d579cd1ca8df556fb3eed3398e05dc043563a52

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