Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ba9411151dc74f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 17:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd0d175c257f564450d3850ca2168173 SHA-1: 015536aaae1f8de65beb0c5cea36a53eade8af74 SHA-256: e1ba9411151dc74fc844b25144d8ea88688c5e8247a4eb67634371da83de9093
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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=mouse+trap+rules+pdf PDF link annotation
    • https://maria-galland.ru/files/file/63958553658.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/tenogepete.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/68610992220.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/danejigosafemiwo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwadubatageborof.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/poribuzifox.pdfIn PDF document text
    • https://wecareprogram.org/images/file/kiwur.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/88062906225.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/noroxemopejerej.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137699206a93---noxugenazilasobexo.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/91039901801.pdfIn PDF document text
    • http://cutskytools.com/d/files/45198181864.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/savarivesazuvuradik.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/sifoj.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/sitetigunetuvofomisok.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/gofinawejitojunififalexaf.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/mufanezovifedijud.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pefizekaxikedaluwejimetef.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vewav.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/ritositomepesirenakusol.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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 17600 bytes
SHA-256: 9723d834145eea3c2c7c72c1ec80a1516cea3f9054bd21f34768e55757106e75
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10388 bytes
SHA-256: 237cec9a0df7f8c936394f454b98c7735f7f1ad6e49aef2981eb28a862295945

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