Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dc623eddc89ec4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 23:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f7c74b9067b2e29331cf48c9d9f88db SHA-1: a6c5b4eb5290334da762bc9fe0b4416d78126d5b SHA-256: 14dc623eddc89ec4e4cc1e2d075ae2c004226d197be4674eb37dcda1e3c7483c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, indicates a phishing or credential harvesting attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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
  • 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 http://clinicaveterinariasangiacomo.it/userfiles/files/mipaxowawupejubomawip.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cd2d78f---mizawejilenopar.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/76325354944.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/54272446241.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/70012090705.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/vifave.pdfIn PDF document text
    • http://computerdoki.hu/user/file/josimerusomonujitun.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/mutatifexewipuxubaxixaj.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/14276462601.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/40514840474.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fabivimuwasevonogopubode.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/41928036565.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/17779512336.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/796314361.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lazulelufepidoxix.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/kosalafol.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/mekamixige.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4dd74daa---71444921638.pdfIn PDF document text
    • http://www.polni.si/Images/files/kiwazuk.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/befoziduravopob.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/rimagisalege.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/jifasaposeriwovoxedo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/12243652523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=play+modded+minecraft+with+friendsPDF 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_off0000ae64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE64 10940 bytes
SHA-256: a9c4ed5a18fcf9b4965c4b1e15a577d8a6e3b19192e7f127a0f7b376cc39a5d5
font_01_sfnt_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 15272 bytes
SHA-256: 13cc0d679dda145b642977855f3c1f13249192a9f4c14d718b9c0f9510a1f46f
font_02_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1