Malicious PDF — malware analysis report

Static analysis result for SHA-256 38609d12468351ac…

MALICIOUS

PDF

86.0 KB Created: 2021-09-25 14:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e6d65024993c097ce4e74583b630f04 SHA-1: 3edc660fb930317b95467abddf2f021ccb8deb18 SHA-256: 38609d12468351aca24f2936bc12d55e086f755a5bcd9dbb6f7eac16c4e72f28
126 Risk Score

Malware Insights

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

The sample was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The lack of readable document body text prevents a more specific analysis of the lure, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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.
  • 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://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/gopirabituwelafagatazu.pdf In PDF document text
    • http://kuppersbusch.hu/userfiles/files/zotowovarikenozavab.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/46661866086.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/bafigesik.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/34433468997.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/19237680955.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/12487015958.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8e074dd2---71789076238.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/maxuwa.pdfIn PDF document text
    • http://netflor.pl/upload/File/wunurazuj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/89856428273.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/powuramolidorerezinerugab.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec9153c19---jezefaruzexeni.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/70244442523.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/xalipojobefiluparamalu.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/vofiwuxilubunuwolenuwala.pdfIn PDF document text
    • http://labradory.pl/file/70505153026.pdfIn PDF document text
    • http://office-agglo-larochelle.fr/userfiles/file/fofigogobiwuzakotubafi.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/2945464864.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/kolepunigun.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/83047554313.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090209131073499.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/wonirawuxize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=%D1%82%D0%B5%D0%BC%D0%B0+iphone+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 16420 bytes
SHA-256: fb3bf67d4a2e9dfab39fb52a842138f057886f866cf0b3ecf42f8047a6a39aeb
font_01_sfnt_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 11632 bytes
SHA-256: 611420e2b48ba6ce949118e4afc673b8e8d29fea66e7c6e3cb3e6496620f4da9
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 27404 bytes
SHA-256: a166b996212152a4f0f57a830bb93b3d17f42a5d2de25d2e208bb0632c680d24