Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e814f693c8c038d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 14:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ed8140440ef96bf103c46d2d294eecb SHA-1: eaa0aeeea553a823e582b98448659d3615cc667d SHA-256: 5e814f693c8c038d68e167589f7bf431b02a7783fa97be232a6b7feacad634de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic indicate a high likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://synerhu.ru/uplcv?utm_term=king+of+fighters+99+apk PDF link annotation
    • http://dentalclinicbangalore.com/uploads/97905915145.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41990063388.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/zutowufa.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/jopoko.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/fawogufuleferamus.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090203380273499.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/lekaduvusukasibojimegus.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/ronowidegapemuz.pdfIn PDF document text
    • http://rayer.cn/d/files/jekekaxifeko.pdfIn PDF document text
    • https://biocoils.com/img/file/95430303846.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/sizipopopeg.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/lububusabevirofikopelab.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xerudigav.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pamavisanetudigemuwusut.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xilavagexokotabupupujofi.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034619.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dazokadelekoralagosudipet.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/gagitagutevubiwu.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/92882298362.pdfIn PDF document text
    • http://uteambio.com/upload/files/xonitononazaxulo.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905120229.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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 10840 bytes
SHA-256: d2b32a26bff0d3c25b7dd7546c475f79af99ef9c79f33c77b423ace32e76f97f
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 17908 bytes
SHA-256: 372ee460fd528315b3170dc71cb50408c1d7e0a8a159a91a839192b99844a90d

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