Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4428a70946ca32e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 16:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fafbd368f2dc7c7c94808b35b2bc2a9 SHA-1: 5a1c954ea41fa27fba0394d67dec5d90ad5c1aa0 SHA-256: a4428a70946ca32ec8c75cd133282ac371bfff3e7041e9d66b6d325188df4701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, with one notable example being a link farm on disposable hosting. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=0gomovies+malayalam+movies+2020 PDF link annotation
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/zufeve.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/87379000588.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/72929911074.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/36118280292.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/lubagafuwugulu.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/robazuzus.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/64041288674.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/jileredidebefewixuwa.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/11555473109.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/7258494427.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/dujexezaketuj.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d9d92f1e864f2e8ff000e5446eeacf60/68003091123.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614061e44675b---4684486186.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/xedalawara.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/ratidabufeledo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/rovinerezo.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/3401294825.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/2254399793.pdfIn PDF document text
    • http://friulanapanini.com/images/file/71530527553.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/19267905020.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/45669938201.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/91804150283.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///dobekide.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/68831028619.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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 16432 bytes
SHA-256: 441be9b79819eda7ab80af5505c95c8e17ffa0608239b8d2c710ce656ffabc29
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10476 bytes
SHA-256: f5cc643dc2f08691f5deb3253f24d8d3f9f09b17ee5f258cf24460919f31550d