Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d740d1a1b67faf8…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 14:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2820446004aa42a9fea3d81b073893a SHA-1: ffa50f74f3a34f3d6a9162541a04d9a9b144d93d SHA-256: 3d740d1a1b67faf83d0c1a69661cb1a5c532bf4edf87cfc42ba35e5d1efc0596
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a link farm designed to host malicious content or redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or host multiple malicious files. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dadesigning.com/daduserfiles/files/14833132987.pdf In PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/magisofitejafinuwobanud.pdfIn PDF document text
    • http://nature-revive.org/files/file/funapejofijo.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/feziw.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/be31b2f31459d3a69b6267ba203e3302/gokogibik.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/xipiku.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mekolivol.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/1586925394.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/waseratirimurijorekef.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/16194283086.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/napefavodobej.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913094931.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/88848324511.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/94753577590.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/6683246764.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/zezok.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/kudemadapotoxaj.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0924/707008fbfffab0b52f01dede9f1ba0c8.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/xiluzasor.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/74941436759.pdfIn PDF document text
    • http://ellev.fr/upload/files/738500529.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jetezotivajekapixarin.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pixolutajaboxumujosiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=community+interview+questions+and+answersPDF link annotation
    • 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_off0000b2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C0 17732 bytes
SHA-256: 44bc64095ac5a153997c7e1c40bdcab93faffdce36024d01ab125890cd2fce55
font_01_sfnt_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10908 bytes
SHA-256: 53c5c50e2cb0cd7c79f98d0b666445b7b098a25af8450360c476065b3ee1cf19

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