Malicious PDF — malware analysis report

Static analysis result for SHA-256 804eba316fa37e0c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 12:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d80b7a355136bdcc6db8131be438187 SHA-1: 21c431d49323464ac9a64110eb736c43bd9d6081 SHA-256: 804eba316fa37e0cf67af7b65eb2102132c16efb32002d19a1a43ccef71c431d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://laborke.ru/uplcv?utm_term=i+have+dizziness PDF link annotation
    • https://dd-inside.de/userfile/file/duwofepole.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41588595860.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/34443698739.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/budazo.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/luvelemulosisawel.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kinapa.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/gatixaninezazisafotilujin.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/megiguwobawuguzu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/godotezotojusanot.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/18179873117.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/gikinupotepupelokisogu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kelevaduxebupatewi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/fawapinijazomurogaluril.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/99918513173.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020824465210.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/26284253381.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912024830-10654724087.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/boxowurikokimosexabefede.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nopakaravimosafuledadosav.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/36616155213.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/metovexog.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/26651194124.pdfIn PDF document text
    • https://ijpdua.com/contents/files/sulinusemipilu.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/nozuzopaladamim.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/gekejefolakikebovok.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9af59fa3---32784724511.pdfIn PDF document text
    • 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10060 bytes
SHA-256: 7840e592fdc0f603612bdd9521d3ee3e563fa721f636a7d103b028408b17ce42
font_02_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 16904 bytes
SHA-256: 2bc1727dc119409e5f4b36c450648924825250cd04a43727cb3f20a3b589e9b6