Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0713dd709427e6f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-22 23:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e918f2e9e8541a324c68452f06524890 SHA-1: c65b14111a76892f8add1da95f256e29c77db69b SHA-256: d0713dd709427e6ff6c9dde37d2e543279804d85a40a3fcd6b63398f9b102f31
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common technique for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8018

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/uplcv?utm_term=stream+mma+live PDF link annotation
    • http://prtourusa.com/FileData/ckfinder/files/20210904_B38BF9ED23C4C124.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/43467629161.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vudazukuxepomubelukumeniv.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/7437990676.pdfIn PDF document text
    • https://davnosti.ru/upload/bonamonerivix.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizin.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/redesitesavof.pdfIn PDF document text
    • http://infoguard.ru/content/file/84724236449.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/lazopaf.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/99889538251.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/rupasakekiv.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/gafewizala.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/34373378236.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/wuzisibatuwutalimival.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457369d597b---2395602377.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/lumisabififad.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093f1cffa1---77771733292.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/75042210659.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/1352311143.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/61278173018.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202197_55854_863.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 10016 bytes
SHA-256: fa92f4789c39c47f7abe78814f608edce45c101bdd03d27ded48cb9a5597645c

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