Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c77237c4960a8a…

MALICIOUS

PDF

80.0 KB Created: 2021-04-15 12:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c24a454d6a9baa8ab3f769739cc1ce0d SHA-1: 0631269160cf779bdd984b71ca967d77dbf49a32 SHA-256: 29c77237c4960a8a9f4127c3a1febb86973ff7dbe6126cf84933f0c3ffaa2c2b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=mfj+259b+calibration+procedure PDF link annotation
    • http://dadegufewen.iblogger.org/modelo_de_anamnesis_para_nios.pdfIn PDF document text
    • http://idealica-italy.site/los_atributos_de_dios_ipucazl7p.pdfIn PDF document text
    • http://proita.fun/gabirexonarorepibefebq9b3j.pdfIn PDF document text
    • http://mon-cmbretagne.com/vuvorakikofawirezedagubigly0p.pdfIn PDF document text
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/sufozuwojewobili.pdfIn PDF document text
    • https://riximuboderex.weebly.com/uploads/1/3/4/7/134744564/lobap_xamadowedup_ganozizopivope_fivakejuwug.pdfIn PDF document text
    • http://wolotalute.iblogger.org/13704847931.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/2cd07.pdfIn PDF document text
    • http://interbank.link/is_call_me_by_your_name_a_book_series6obop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banagegogidilad.rf.gd/brochevarevarura_movie_songs_naa.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_b5868b3db5d94bf08b5e36d5ccf4883d.pdf?index=trueIn PDF document text
    • http://dokilenosabani.rf.gd/army_of_the_night_amaranthe.pdfIn PDF document text
    • http://nedomovoguluz.rf.gd/43188007168.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_41bcdd6c272546b097b755915f4d9f3b.pdf?index=trueIn PDF document text
    • http://tinijev.epizy.com/public_relations_campaign.pdfIn PDF document text
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_e4cb9abd7e7347df85c06f188ca9de8b.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_cda7970a562b4b4da483101762c69fe7.pdf?index=trueIn PDF document text
    • http://rafidomemekovig.rf.gd/the_lorax_book_plot.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/docker_arch_linux_guide.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ea7f8e28457a4b4fae471106823e88ff.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 5604 bytes
SHA-256: 9c6a510bd8d99f13479227891b7f2d4534207869fda1d23d57f68b7da40cf522
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 11512 bytes
SHA-256: ea56d52fa82ff067ecd5c736aa5acced2c4f9eab9b00bdbe7da820c5741c9eae
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e