Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccacc7d2730d569…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 13:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ae4610e1107c67673c0836c1b3a3322 SHA-1: 3a66a208498f68e1b132ee96ea11866aaf84af5f SHA-256: fccacc7d2730d569301d5f6cf3e25e027c194c8ddf78ea91d6925ef5e26a7e38
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection suggest the PDF is intended to trick users into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://assofmt.org/ckfinder/userfiles/files/vodaxuji.pdf In PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/mofubo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/6635665440.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vogidi.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090210480373499.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kololokojariwenito.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/danuridosimezezuratuwupu.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/16064794029.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/mebinuvarunirel.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pipanabuzubig.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/wudetofasarurevaj.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuwalakotozudex.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/puterujoniworivemasew.pdfIn PDF document text
    • http://4tyres.nl/public/files/31701203896.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/95420442287.pdfIn PDF document text
    • https://harmony.im/userfiles/file/92050203161.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/47346403136.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1ac31023---warisavejegezetew.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/33853171721.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210914_1350E0B64B42CB13.pdfIn PDF document text
    • http://osayit.com/images/file/majurulizalolupegexalobiv.pdfIn PDF document text
    • https://armenia4d.com/contents/files/pozirabeg.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/11764682894.pdfIn PDF document text
    • http://trevorhannant.com/24679777407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bank+chor+full+movie+downloadPDF 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10872 bytes
SHA-256: 8fbc41cc1f70a5b8ddbce7594833a3ebf32e677254805d481888963045a75283
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 17292 bytes
SHA-256: a3a2bf718023bf5d67efc9a957bc51d208c37b0d82d9a9c7be20fbae2368a319