Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4765d02e471c41…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 14:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 895bf54ccd55218978a5d40998a10359 SHA-1: 58a3f2e1ab82c0062f88b236587ace3906981c6a SHA-256: 8a4765d02e471c413612f904497a0615655c01b149fe66a9b571ddfcea65e896
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=clone+phone+app+use PDF link annotation
    • https://priscar.com/documents/files/37048387215.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/tinepukipazumu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/xurexekufufizapunibuwi.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/lutuxotugijoru.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/setasowaboroliguvubepow.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/88194295503.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/9740633498.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219131731214361.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/37328080529.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/jufakepirojerutolikawow.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d71c3471---lasuxupadorewidelo.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/kudulapuluw.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/mojijabuzaf.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/58264423772.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/63010074552.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/66113952363.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/10317567738.pdfIn PDF document text
    • http://pmke.cz/pictures/files/sidesisevifonif.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39dcb0af6---35496620582.pdfIn PDF document text
    • http://voijin.com/userfiles/files/babori.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tunebefewaxonula.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/butuwilek.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/15849853873.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/11791984507.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 18596 bytes
SHA-256: 22749f7eb3d4602dfe039d99251e4ef99d9d805a36e7f774d9768ffaa8399e23
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10192 bytes
SHA-256: ca03002bdb5971863fa5d73fa65d85ca4a0cbbaffd983259b9b1e6cb5eedce42

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