Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10c8b10399aae1c…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 00:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 410403b612d3858b22e4c569468ecf60 SHA-1: b442a6ccd9628043289da2d0d692a75499d0928c SHA-256: a10c8b10399aae1c36cbe0b0b4c259dae1882ebc9a4aaf2c4354e867724dddd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of many external links suggests an intent to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://101balkon.ru/upload/files/863868686.pdf In PDF document text
    • http://kbidc.kr/upload/editor/file/1632713353.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a18b929---12071351159.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/59070386310.pdfIn PDF document text
    • http://lobi.md/userfiles/file/vegilefonove.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/32204539616.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/1049240126.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/moxuma.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/69891059224.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/likomebetimiw.pdfIn PDF document text
    • https://italvaping.com/file/zuvitepaxekewu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/79681990931.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/devevivezakopapukuzipav.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pobafuwegilarunexigezejar.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vigugajipomifukafezomenu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/71304377302.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/94107199647.pdfIn PDF document text
    • http://esangsok.com/upfile/files/tiwimaruja.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/79827057807.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/35052941477.pdfIn PDF document text
    • http://apsons.eu/files/file/2591135821.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/kavobagiwomonew.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/ginixijatupozovovodo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210912162832_dns8vh.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/36704453730.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631814721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=skin+infections+pdfPDF 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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 15988 bytes
SHA-256: 000af63679bf54d37b563a6fdd6e04ffd549eeda0b750e82b088e78232f4f8f8
font_01_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10472 bytes
SHA-256: eb72117df283f0b7003723fd745747fb29f2e57be7cc0009a62614c0bc118b8d