Malicious PDF — malware analysis report

Static analysis result for SHA-256 038458d729ba5cf3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c1ea4fbb0c12a2a8a084a832b5a6146 SHA-1: 728bb95f4ae9a7ebe150fb4d8f090a5baf33ad3f SHA-256: 038458d729ba5cf3bf3f833f5b166b9f372d2d367b790362e3ea9b64c8c0d7b7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to a large number of distinct hosts, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7213

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c76t0uu6dd6lnf4h8mgc6jfoaj/dekobuwesemapemosiwe.pdf In PDF document text
    • http://gyogytornasziget.hu/uploads/files/8420786492.pdfIn PDF document text
    • http://zuszdounky.cz/files/wesogamejakosuroseresi.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/foremavidatufuxot.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/46115612728.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zulebofuxatinegonoke.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/rifobitefevaligoxujeliki.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77128154042.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/kipevuxekibe.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/53445984316.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zegivojonigepib.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fizitarapidedodilib.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/46728228015.pdfIn PDF document text
    • http://e-sheremet.com/img/giboderilopumeka.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0e6ea8d7---xuvuwiwefovemalexu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bekutajowagelofasa.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/58768882408.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/25301945397.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/84623393575.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/fapinabetobitopedamelef.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/14288534655.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912163829.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/gomekagixigonujotubogul.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=visual+anatomy+and+physiology+3rd+edition+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 18520 bytes
SHA-256: 081937174a6ec2e5f89d7c95d4c6f4009d81339e45f82489056060811c9b69dd

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