Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d985e8c68c357a2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 22:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e6f380c04ea10700ac39b948fee116b5 SHA-1: c7d301af832b324cda9130cf839413df36478e6f SHA-256: 6d985e8c68c357a2cf2fcfdd565d85615dc359978ba6a1943a6e7f6ecc2d9bdf
174 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a high number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or phishing pages. The presence of embedded JavaScript and numerous external links indicates an attempt to execute code and redirect the user to malicious sites, likely for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/uplcv?utm_term=system+update+malware PDF link annotation
    • http://abwpetersburg.com/uploads/files/wiponenimegejupad.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/89314373450.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/1925947045.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61345085597.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/pomufololetutirawubukab.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/57298037913.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/15664419509.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/lefinoladisomulobuzej.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nijosibowefefedegamiki.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/66707796110.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/21156544502.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fobozefarokipapavumuvu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/31326803608.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/kazalar.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/55992486472.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/gemitifinusuv.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/34945238478.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/69842372351.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/89875522241.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zirisokitub.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/69730960867.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/27f5c7c446cc1c76eabd251187121be2/93036245843.pdfIn 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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10612 bytes
SHA-256: 38911daac313b9b977435c0550b108e3cc307312c13e3eeaa67fb3adb5fc3263
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 18240 bytes
SHA-256: 04288c2df9e6f24298bb439a0f48ba9838e8d9a2bc917318bcb84f64f5e02aa1

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