Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6545d457f0370a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 13:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13337f1ea0f33766fa1d9c193b0b4efd SHA-1: 0fd3996f234e2a43678644032e45db7f1331bdc4 SHA-256: ab6545d457f0370a4c0b6090ebb0effcc38bc0c8550684693545bea8ea4c2b0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the PDF is designed to host many links on disposable domains, likely to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://vetsnab32.ru/userfiles/file/liluko.pdf In PDF document text
    • http://kiko168.com/UploadFile/file/20210905143028098.pdfIn PDF document text
    • https://vendax.ro/files/file/31024779364.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/17840824079.pdfIn PDF document text
    • https://denimder.org/resimler/files/42408559496.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/ligavovefotanadanafi.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/kovemubexola.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nulafovepolisonabane.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/rololumesagagevojojopip.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/zelifazuwululunepoxo.pdfIn PDF document text
    • http://travellerisland.com/files/575929238.pdfIn PDF document text
    • http://intersonik.eu/upload/files/kebisadumikopilanijugilug.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/40714715841.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e0bf41f575a7eb66363b51eac6290ce/58117098106.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92c25a7fa---norojixujexonadiw.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/55163061735.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/99716432134.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/misotetuvepebutanisugopa.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/84020236880.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/48873278089.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/ribepanasi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/97975370868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+fire+lag+fix+mod+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/namiromon.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_off0000b666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB666 19720 bytes
SHA-256: edf263d261bf6b7b81d7e2136e378f5f17917c9a2702d17907a4421bff42ec7a
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10644 bytes
SHA-256: 491883fa3a7561e1e7603c9a0ef60c68eb5a1bce7412c1a19023bf570ab4ac00

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