Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e00c9ac1d820f2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 15:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55a3829082749f9ad39a1a2d8b4ebe7f SHA-1: eb951b6203f1f9aa151ad41c8028cbee70841eb4 SHA-256: 44e00c9ac1d820f2600e7f0a3e015de8a63e64c7a09c63d88a419804a530d2b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection indicating it is a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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
  • 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://flixgolf.com/ckeditor/ckfinder/userfiles/files/41310928533.pdf In PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/96845123500.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/nubel.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/36963824846.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/54651415319.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/61785845099.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/waxuxolij.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/zikikogibebifedudiloro.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/xetonibegof.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kasuvudemafo.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/65368465958.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/nikunimewulezowafofoga.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/ralumifemawodogu.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/piredofusex.pdfIn PDF document text
    • https://computerzone.pk/file/49017290256.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902182735.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/97777998820.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/mepebisevozonebejerijetix.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/givuke.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/24354186185.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/15879034522.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7a2b83d4---69254973349.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/43434969825.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/sojulagukemat.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/xofutaset.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/zenosivefolijigufol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+android+photos+to+iphonePDF 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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 10704 bytes
SHA-256: ac1da90b0c3e6eefed4bae9201c5286a66f5d9b6f061b8ab29dd5c64113e7022
font_01_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 17380 bytes
SHA-256: 9a3e2d2eef127b65eef10acfa128d5f01536f5281cd2762666917cc046750489