Malicious PDF — malware analysis report

Static analysis result for SHA-256 43acd49dcede815d…

MALICIOUS

PDF

81.9 KB Created: 2021-10-16 11:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fba133f78af375347e365a4b7ac04388 SHA-1: 8dfb7e3bc5a25201a5b317e0d0bc51024ddf6e36 SHA-256: 43acd49dcede815dc8178980bbff72f7f38aa7e879705d5bf283c73362651708
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coniperfumes.cl/js/ckfinder/userfiles/files/ponisidozelazulo.pdf In PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/59316260602.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/litujexawugen.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/47835200121.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/62333844234.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/povowuninotoret.pdfIn PDF document text
    • http://nscenter.cn/upload/files/janupovawegavadefa.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/bofajiw.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219122314245257.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202110/1633757182.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/90513736214.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16156331978472---81181832022.pdfIn PDF document text
    • http://soc-in.com/data/media/files/vexumotaxunikosejoferi.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/pulatovaxukosedarid.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36312784967.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vuvizenoximorajasupamavuz.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/22677209728.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090723370292.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20211015175403635.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/17822644024.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/42380248450.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/59697741952.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/60322684773.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/limowezizomemazodulazavon.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tvn37l2eulih1mqa657s7g739e/zeturija.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/93502899085.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/77804815489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=where+was+the+third+punic+war+foughtPDF 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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16660 bytes
SHA-256: 651c915428e8df67cea5489e2521074e019313ef5dadc8398dea9c4c2b3a48d6
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 11032 bytes
SHA-256: deb8ee5c2e65e8902ca3d69f924e03afb5471303c60a9ab60c333fb05aa427ab
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1