Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b62bb385cbb75b3…

MALICIOUS

PDF

93.0 KB Created: 2021-10-01 05:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1e343aeb9b3b5e227b10c1de6562c52 SHA-1: 9820e14cd38b5b30251dddd64c188b10bd514a8e SHA-256: 2b62bb385cbb75b305bd38447101a051e38105068d2a470dc434d36c58b7690c
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to distribute malicious content or phish users through a large number of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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=advanced+mechanics+of+materials+boresi+pdf PDF link annotation
    • http://emailreceptionist.net/userfiles/file/15999347646.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/97560418222.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/suwosamab.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210930195716995250w7kilu5ga17k.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/36498247321.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/85968885385.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/16852191438.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/41738066383.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/46399575472.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xetozolivevexe.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/jeranuziturepovikunex.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/3228346840.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/fufafulawe.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/wisoserimiwalenemikaxoxaj.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bklr86tmt1p1gb8mepta0avbck/zolesuwifubixezaninelira.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/68811447020.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/49020942258.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/webopagozusaxipe.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/67667683660.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/27052604014.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/11439795932.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/90019898369.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fexuwolonofofegawavufo.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/33b72857ff2708a8cfc590e8c546aff3.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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 24220 bytes
SHA-256: b968b8e9ef7c633a5c1620b9662f1669edd815ed3506d9cedf256b700c26b648
font_01_sfnt_off0001347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347C 11072 bytes
SHA-256: 61963f5673fb265d3b9f1785e667de55c234e0f9c94a70b931a6b6fbee9ebfae
font_02_sfnt_off00014ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1