Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb9d3501cab950d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 08:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd185787e2e6b1f4121171680617b254 SHA-1: 3d671353023a8519765d34f50894fa06db5ad643 SHA-256: ffb9d3501cab950d2f42a2a3b7508878abfbd282e2a72d59854668868d7fa15e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a strong likelihood of phishing or redirection to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=what+is+a+good+music+downloading+app+for+android PDF link annotation
    • http://hiro-seiko.com/upload/files/75053568424.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/pazefegajevoz.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexeboso.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/32966725097.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/kademanogax.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/luwigi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15986243552.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/84255925891.pdfIn PDF document text
    • http://fgosvo.ru/files/files/85426469948.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/mazarabilesu.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-14/20210914163547612442.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ce0ed8d4719b36dcf5f564dcddfd42f2/68413879811.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/dimafopudipe.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/zobojoditi.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/daruneloporokusilotafawu.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/2102146327.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sodeka.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/17909343221.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/denufikewipefazada.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/91201508311.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jinimepaxinapu.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_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 11116 bytes
SHA-256: 6febcb5ffd5d2d21145bd5f9700cc92a988ba58ceab293388ceac7a27d62ff2d
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16844 bytes
SHA-256: 903b286d0dbb9c05346ee7b2142329854e37f0eed5ac0831609c7ca284b2dabe

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