Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c55cf9f7bd75516…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be4dba02bdf43ad06fec4d1a6bd7e815 SHA-1: 737f95e349ef5ed968430012b2de86b69f0f6dfa SHA-256: 5c55cf9f7bd75516de3f7c13bc0451423b0f256a12cd02f3ed8d540efe460493
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, with one heuristic indicating it's a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to potentially malicious external content, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/69kpqcms7u00344hgfqsaij09e/tepexomuvelinanun.pdf In PDF document text
    • http://folientastaturen.pl/_data/file/xikavazuvulij.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/83239086624.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/piduni.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/jebadufavarodus.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/13283b956725b6334da236d578d7a4a6/38914978956.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/wibeg.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/fonupurilizi.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/72398758047.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lanunatubibaz.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/42277583315.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/winepijebapulitubevoma.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wijil.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/8706214743.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/fosisudabemigufitiw.pdfIn PDF document text
    • http://i-physiology.ru/upload/ligepipudipozujepojizule.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kijusugekoxozipalanok.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/93868177459.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/84514798266.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/waxujitafisanigopiro.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bd8f5ee---20097966042.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/kozebupulivek.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/zabojakiroregufuz.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nogatudokivisipepiwovaz.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/towaladagoxotepajolug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=viva+video+hacked+versionPDF 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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17408 bytes
SHA-256: 75b5865e6e31c2883e4ea329c2305c943441a0168345ed62f991573c215cf9e7
font_02_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 10448 bytes
SHA-256: f66efc1602ab68ca395c1ce6e04d513634ef3e137262f79402fbe2f5b8db54da