Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa47de818868980b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03dedbd35d8080901f7dbfa7ce7f7fac SHA-1: d9f532a2d1eee14e070c8ccef5a3dc705f2fe136 SHA-256: aa47de818868980be259f1184d1b5fb9d5c53d895d01f9f0ea2fee525b27f48e
126 Risk Score

Malware Insights

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

The sample was detected 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 hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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 http://bsa-billiard.by/images_from_html_editor/file/telipinorabupoz.pdf In PDF document text
    • http://urduhadith.org/survey/userfiles/files/rokedurexelujoxeragareni.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/16766612468.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/80995931864.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/rubiduzizebutabuselatom.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/48146819449.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/8398367857.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903184641.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/78130913369.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/xujozezokot.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/wetesosufonasaw.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/debalorikawolizelinigex.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a4684f5d---34664245156.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/73672470292.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/33330145608.pdfIn PDF document text
    • http://chenruichem.com/upload/files/62688109272.pdfIn PDF document text
    • http://chromavials.com/d/files/fudorupogetutovuvoju.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vatesovot.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24577844828.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/90384746095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rupaul%27s+drag+race+season+13+episode+4+watch+onlinePDF link annotation
    • 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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 11360 bytes
SHA-256: bf8b5f8324bcd6d95eae4b67d0b50a32c516077728087845d7639790c373c892
font_01_sfnt_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 17012 bytes
SHA-256: 393c2db880c0f80d09887a5245d027d80c10a806b8d059a7cfd6d5bcc2a55e12
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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