Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cc014ef29d1c36…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 22:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 79634ee35402de3adda4abb9f17ee432 SHA-1: bfce92b7e523f1f1737f7cd4c244d58e363b13b7 SHA-256: d7cc014ef29d1c36b3b7ec48ae6ef0bf7d17dcb32144eb04a78ccc3d114cb562
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=psychology+lecture+notes+pdf PDF link annotation
    • http://metalltechnik-kutschi.at/14012016450.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/donunimegikavevuzi.pdfIn PDF document text
    • http://odumakus.com/uploads/files/33667177308.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/pukotutunumubixe.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/87263034437.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/radetonadosa.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/68136221258.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/81141701428.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/zugelan.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/60509416495.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/kotanukasutut.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/pizodovovanesiboxu.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/vafezepasoxelosaku.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/tasamiwomujowututajot.pdfIn PDF document text
    • https://artenika.pl/fck/file/65281553247.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/gogivu.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/983419018.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/60248912873.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/kabazikizojewaloruluneve.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/32874542579.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nolexerezi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/tatifinekonulajibi.pdfIn PDF document text
    • http://baove24h.org/upload/files/10549937191.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/95518624701.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21091320070328849657p4m5hb06ii.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_off0000af72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 10860 bytes
SHA-256: 3f06f22661a230861586da1d000fe7b6763a99d58b359965559d50403234048b
font_02_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 15568 bytes
SHA-256: b5e56d7b51513e2d4935bf81d6c77bd83b5a7c995da1953ff2c695e165fda5c4

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