Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e2c47162ee0cdf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 23:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff2866f3a71b2a68f6d127b4db9eafe1 SHA-1: a9d67e01959bc169861da25d1a9106c157902dcf SHA-256: e7e2c47162ee0cdff8c5373bcb7c8aacd01b56e6ccf33d662d0271b7200ec151
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The numerous embedded URLs pointing to various PDF files suggest a link farm designed to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+generate+signed+apk+in+flutter PDF link annotation
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/6321042675.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/29f84a6e547c7d9108d8da3860ed11c4/vamifeb.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/52308235165.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/35306228140.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/68074988761.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/ketabilinunurazanusa.pdfIn PDF document text
    • http://195exim.com/datas/files/8391331992.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51704406236.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vaxeketebolex.pdfIn PDF document text
    • http://keramann.ru/uploads/files/12858937131.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/fatolagujexawos.pdfIn PDF document text
    • http://trieuduong.com/images/Download/zevuxawozagimudokir.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tababudugajododibesu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/37664285121.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138101a0c440---welatikagakuxanatisex.pdfIn PDF document text
    • http://taigesw.com/upload/files/jodevuxixojorubawo.pdfIn PDF document text
    • http://rideco.hu/upload/file/dotifuvepuges.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/68338000751.pdfIn PDF document text
    • http://askort.pl/Upload/file/zefofoparivalukogozebe.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/debatisunarebokajiwutos.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/kapodujezu.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_off0000b837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 17252 bytes
SHA-256: 14182aad39ae5e87cd11a851afea84f91ab35435f991e82ec04bcf1efb269d3b
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 10940 bytes
SHA-256: 6ea97c65ed5db29f61910324d7341639163f8bb49bcf141e04319fafae6b4f4d

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