Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecdc3a70aa21d03…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 11:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cefd85d133e9a1c0768280d1e7e60a05 SHA-1: 9bf3f9d0a57ec0f02022c548d88e1581abbcac84 SHA-256: fecdc3a70aa21d03710d4fe095a205946baa40e1801215bb2a21c4d7abd2e78c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://flairpens.ru/uploads/files/58350096662.pdf In PDF document text
    • http://www.kymkarajok.net/tiedostot/files/78808802863.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/dufiline.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/41281705274.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///ranugesepadenepepajiwoze.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/44063646896.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/juzavuwuvi.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fowipipujaxemoguw.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/65253769169.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/xupesunatibotene.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/47751546978.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd9e022e3---durowavigebiz.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/71350653806.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/depezixixurivoxovax.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/70006830011.pdfIn PDF document text
    • https://toocapen.com/files/99656247135.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/11177277259.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/789815213.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lodejof.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wenaru.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/vekifobufofizi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jarusakezevuniguk.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69658071456.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/jerumolevenebovumevexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adults+tv+apk+firestick+2020PDF 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_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 16496 bytes
SHA-256: 4bac6571f31214a7848983ec50f58094a3cc4d9301ce5f8eddfa7ad3f0118f01
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 10868 bytes
SHA-256: 3691aa7a84633c8b4bd7084c4a26b662029f5f99e0e403cc92e796899ca3816e