Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f89ce86f22885c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c542e2775a122b9a05c0a1b3363c0f0 SHA-1: 5e8c393d150078d5d66098443244f2c7c79327fd SHA-256: 41f89ce86f22885cf67df830039c086a668c4bca8b057d121894ee298a38e855
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or redirection scheme, potentially for SEO poisoning or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious content delivery attempt.

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 http://lnv-cnc.gr/userfiles/file/lukimagofunelujedijuto.pdf
    • https://bahispesinde.com/gnc/veri/_files/kazinitoxafifizazawud.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zasikir.pdf
    • http://hoanggiaphatland.com/uploads/image/files/nisimefiwamujesepofo.pdf
    • http://gardatrans.com/content/Files/fujuxox.pdf
    • http://suurelepa.ee/data/file/danebuxuwita.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kusafevanudevowizav.pdf
    • http://jeyadhurgatemple.com/userfiles/file/karudopefevadunuxagoj.pdf
    • https://lockerova.eu/admin/upload/documents/maravapokibedokalorepo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613976c0d8dfc---mosawetikovexisupelipi.pdf
    • http://mofrantech.com/userfiles/file/63273025640.pdf
    • https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fokofi.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10618139826.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sikodoforoj.pdf
    • https://technoarc.net/userfiles/file/74480203516.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/13337565740.pdf
    • https://tivicom.vn/upload/files/60077228309.pdf
    • http://driver-jazda.pl/upload/file/57898495938.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/46912304940.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/42089257481.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109101051576090.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/20031429640.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/winakamitinudadewisixudif.pdf
    • https://spotiverify.com/ci/userfiles/files/fiworobewu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=run+2+unblocked+games+77
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d4.bin
e736597e3924200059f4a34d1704af34fa44d61e29e127b605450a7dc9d0ad22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 10972 bytes
font_01_sfnt_off0001002e.bin
d22496ef4121cde188b8fc2f98daf081f740ef21d0ce273f884fd16ccbb91cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 18700 bytes
font_02_sfnt_off00013116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16792 bytes

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