Malicious PDF — malware analysis report

Static analysis result for SHA-256 9156e481e1eef572…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 19:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a342d833b36b615974c197a09a9759a3 SHA-1: 33bccc5adb74fb3062e9ab5c1ed60f630e782a46 SHA-256: 9156e481e1eef5723449ac9add8e3762f145ac3b6ffc6b25acffa8ce1ac691d5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further payloads or harvest credentials. No scripts were extracted, but the PDF structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jlicentral.com/images/authors/file/suzejolemikalu.pdf In PDF document text
    • http://novichiha.ru/pic/file/19429079871.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/bulepezoserijoru.pdfIn PDF document text
    • http://lovesenergy.nl/file/nosovebegijaxelemuv.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/14177341273.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/mesuviwuni.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/17029688914.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/62475837496.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917054740599.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614669f848a09---netarape.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/43952813791.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/35699605698.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/74609109355.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/41938800833.pdfIn PDF document text
    • http://yztools.com/images/upload/File/kivanagidedubexup.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/56800796921.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zuxuduwitoro.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/wizuzob.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/99720025806.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/28055645627.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/wanomebuw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa946604a---faxozav.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/94634470093.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/6025883758.pdfIn PDF document text
    • https://bor-diing.com/upload/files/fozudunisukuzudojusilotot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+the+king+of+staten+island+online+free+megavideoPDF 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 14756 bytes
SHA-256: ace10d5515af312984c48ca2a5470165b78452d2f03553f02eb7cee62b4df210
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 11076 bytes
SHA-256: bc98ec9596709b09b8c2a5308d4413b0c4aa66da3dc4d57831b3fd89f394c05e
font_02_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1