Malicious PDF — malware analysis report

Static analysis result for SHA-256 5769d544bd9aca5c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca5c7e62aa4617a5a72a2b729edde30c SHA-1: 2ac7bf4a48c52b48160cf3106b04e9ab9dc17861 SHA-256: 5769d544bd9aca5c09b4981286944d12641bd378e15bcf09b75f8afcb34f2be1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://minhledtran.com/luutru/files/74777277429.pdf In PDF document text
    • http://rrarental.org/upload/file/xijuw.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/wojebevikapexeje.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/61543060968.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/66681486134.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906000721.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • https://izometal.net/mm/file/1612552424.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ff178aa4f14ed261da24157beda513ef/xeretutavebibegag.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/80211422443.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/78368919828.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/84117751131.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88207534252.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/14085963150.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/26757617070.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/22126272909.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • http://baoveantam.info/upload/files/52796535115.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/xesovaribekamemigu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6f4969da---94366911074.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/xixekokololozaferurirag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wallpaper+live+pubgPDF 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_off0000b4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 10236 bytes
SHA-256: 2edb86bdf3d3966fcc774ccda2c18975616b798d2aacfc335c75f3696a4b78c7
font_02_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 16872 bytes
SHA-256: fbe812f217c5220bd46e7d04039f12e7cd247a78e91c703acc72495957aa48c7

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