Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4ff099b6df8ed1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 03:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd80e5c631efd072e9d228a710872d25 SHA-1: 70a32396f5a8f211166d6cd0ae1b06b9e00df651 SHA-256: ec4ff099b6df8ed166dfa0f019eead66b341778bf6aa4b9d307af980f4a7cc5e
154 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external links, many of which point to disposable hosting and are presented as a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier strongly indicates malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=wifi+network+disabled+android PDF link annotation
    • http://mptech.vn/ckfinder/userfiles/files/25059459558.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408c74f419c---vazelurivigetatunadune.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/97554025247.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/jutoperererugugitubaliw.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/44553756035.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/resonabemuxajol.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac695b093---josazupokazanuzatitedej.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/dawor.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/95860735029.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/75968691628.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fuparara.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/32305699400.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/40942517081.pdfIn PDF document text
    • http://stl-hk.net/userfiles/murimuvu.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wuwererajodeturozuv.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/2895745564.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vigolizoxokisemapigedonus.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/sovorafujatot.pdfIn PDF document text
    • https://sapporopools.com/contents/files/bitoluduwumajilibanituri.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/38495922500.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/fepaludedabuj.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/pizoduxisotu.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/78146521959.pdfIn PDF document text
    • http://maidichike.com/upload/files/90352079025.pdfIn PDF document text
    • http://strandedtattoo.net/file/gonepovoginuwurakagi.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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10656 bytes
SHA-256: dd855ea71194851f1240aa1b2d03829af36558e3450b0c2fbe9fba6411c8badb
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 17120 bytes
SHA-256: 5859139fd2cb615160d88e9183e1ecc3e56e6445f1b6bd656d263202fdf35de2

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