Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c30c719c7f5489…

MALICIOUS

PDF

79.5 KB Created: 2021-10-08 05:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd304801502a1be3874a2af667b4dea4 SHA-1: 4daefc6b22a9c0c9b541ac0d051912f94b0fa2c4 SHA-256: e7c30c719c7f548967441dbc364317de6e086d367c81a11be8cc65d6e43cd974
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. While no scripts were extracted, the structure and heuristic firings suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dhleisure.com/ckupload/files/bivajigoredas.pdf In PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/lilozisatij.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/68426696437.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614606f163caf---pokafevolezekojadudeme.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27324913404.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614238daa5f38---ronevese.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/35344466507.pdfIn PDF document text
    • http://skisun.it/userfiles/files/25266953602.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kafadudofosibovoxasotivam.pdfIn PDF document text
    • http://wsm.hk/images/files/bemisurukemex.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/fimolamukonewa.pdfIn PDF document text
    • https://petribax.com/userfiles/file/febokelupolurekava.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/didivakezonuzube.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wisetawojon.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xexefaj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pasarozagodolagabude.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/24842391163.pdfIn PDF document text
    • http://klhl.com/userfiles/file/govozolub.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/vobilifekotejepi.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/17193559441.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/80433739212.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/gadogujamavedoveterapalej.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/figawo.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/notisejosolotigurudux.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+coc+th10PDF 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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 10048 bytes
SHA-256: fd197bcd65d5064540b70342aaa30cb5f81e400395958a4303058cf0dc8c0470
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 17584 bytes
SHA-256: 420cb6f895ffe5a8787a48a90aa13aed6db09e668756a81d6dcdc4be3173a6bb
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1