Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23bcefef6882f84…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 12:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fb49b81c7f2d783d29bb890c728473d5 SHA-1: 5310de6e318e00c771a730ee6186d16a374f9ecd SHA-256: c23bcefef6882f84b138b2a310f33a20781603726e8e59a01d69066772f121d9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=live+action+streaming PDF link annotation
    • http://tdjl.com/uploadfile/file///2021090605193536.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/99855104420.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/jimagijibunusalaf.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/39578947291.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/5732767702.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/kegomuwuzarim.pdfIn PDF document text
    • http://proxima-online.it/public/file/19682477130.pdfIn PDF document text
    • http://atrsara.ir/resource/files/6704063904.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/38753754693.pdfIn PDF document text
    • http://baove24h.info/upload/files/79022434698.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/19417949168.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/73754995008.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/81726494302.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/35912484526.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070552437636.pdfIn PDF document text
    • https://onecre.com/images/content/files/nomomefafeboxesasakijaru.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/vipamitimegi.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/72007306899.pdfIn PDF document text
    • https://funke.be/data/file/manadelubupofudupenup.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tijiri.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7a0c96f---11320217374.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 17604 bytes
SHA-256: 58418b4b3d5101a01563278eb1aee3816cee8f116bbc46b06ac8257fdcc8edd7
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 10548 bytes
SHA-256: 30374b0dcb72241ff86e8e6290d5f48ab050efb3fa7cc14ac6a4b543b04d4f59

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