Malicious PDF — malware analysis report

Static analysis result for SHA-256 527f16fe5a513652…

MALICIOUS

PDF

83.5 KB Created: 2021-10-11 13:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26f62cf54d5ac658afd5deaa43d9bbc8 SHA-1: 6baf94dda15e8966dbfb96faaa917fe1cfc5a5ef SHA-256: 527f16fe5a51365228b7e5cd038bb7ccd5807dc871f40a3064faf95df73915a6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to other PDF files, indicating a link farm or distribution network. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically identifies this pattern, suggesting the PDF is part of a scheme to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/zonapekegobamov.pdf In PDF document text
    • http://tikatalog.sk/_files/file/9707656596.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///99995145367.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jowulupagejapitexare.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/welazapudigeliki.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/20752569257.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/89522619600.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fojoduka.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/49598057187.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/gonupedowowima.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/64513644706.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/segaraka.pdfIn PDF document text
    • https://blogsma.com/files/tudonavufenipakamezavi.pdfIn PDF document text
    • http://ternovykh.ru/content/file/dowimosavobib.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/91275425626.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/9926359375.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/tupivasutuboboj.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/titumelagege.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/goromaregafazurewadolifuv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159a9d2d8047---24062862598.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/31059181138.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=one+day+is+one+day+in+afrikaansPDF 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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10436 bytes
SHA-256: 8cc6d0cd53ceaaecae22b6bfc06e41c57e3840767140a228a2baa45b32307c2c
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 19112 bytes
SHA-256: 4ea9cb8145e479b7a91a1b0eda21602389c446c26625b70104a644abb1ed7b85

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