Malicious PDF — malware analysis report

Static analysis result for SHA-256 8033065a27069ccf…

MALICIOUS

PDF

77.2 KB Created: 2021-10-05 03:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c986cd2d95e3466685cf769439a4cf08 SHA-1: 8b6b0d3e25a1dd7d33e197693b646aba9af1f7c0 SHA-256: 8033065a27069ccfa8c5a322385d390d130e2f8855f63554341c7c18f3afcc6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ywint.com/ckfinder/userfiles/files/1632786885.pdf In PDF document text
    • https://afayl.com/userfiles/file/zevigupifosef.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/molobozuzinimasodaze.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/32704591538.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fukujepuwudagunimusekebo.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/16809934992.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155fdc719229---jepinogogizeziturubot.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xowugagakojalukejoxaga.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/ropagevewesorirorizunixu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/jebulitotovusirusi.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/witisajadinivofipedepokek.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/1913047544.pdfIn PDF document text
    • https://expomediainc.com/upload/file/3169912555.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/melowitokeforinu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/51487871135.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/rapubawita.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/jozefosa.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zitetewakezugegetizekilim.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/51559914348.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/73737352851.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/36732897233.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/nobilosefozixufiludulekex.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/21211924925.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jefifaralokumufufusavupo.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/tifabiwurum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=causes+of+spontaneous+hypoglycemiaPDF 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_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 11072 bytes
SHA-256: cb1822e277bf92b688963b6a1e657441ab8898c64f07c8baabd925c3b6fbf27a
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 17388 bytes
SHA-256: fb6a8543e99820ed9384f33181db1a7c9d1d4584e0475fdb05c88d1a422be568
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1