Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7fe9fa77a7efc1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 12:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4ffb95770cf80ffa29fe82b21e39e0f8 SHA-1: 1a573e2d6a55b9811d01c1c3df5facc6612698f3 SHA-256: 7a7fe9fa77a7efc10670122812412b2c9cee09f4ac089d5761f7509dd352cf32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host numerous links to external sites, likely for malicious redirection. While no scripts were explicitly extracted, the nature of the link farm and the ML detection point towards an attack pattern involving user redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://tranhtreo.com/images/ckeditor/files/rixebonuwodiroku.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614104448312b---sabutudowulu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/97549367843.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13863549805.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/81200765399.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/81963854996.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/jatolefoxupejagodaduruga.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/jipovebazi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109020837154750.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/79239512560.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/955ipkkvevqlloulf7pjv07on2/57066724137.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/75069894136.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/2884941797.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/50451076527.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/puwetozoziveki.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/1180859527.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/10386735736.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/28895912766.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/segujofafug.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mobobifunofate.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/19897112413.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/jekubug.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/97094672036.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/tifuzum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+can+parrots+do+in+minecraftPDF 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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 10832 bytes
SHA-256: 1a335a3c3b55e9d14fc9c451ea4d491dd76c6bfd040e5b23138be58db3885888
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 17576 bytes
SHA-256: 82ddfc51554ee1266e5188374da9960e2644e56ac24af0de455ed7ccc050d4e0

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