Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68867915a357751…

MALICIOUS

PDF

78.4 KB Created: 2021-02-24 19:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25fd060a1c7fe63d85af21a0f7713069 SHA-1: bce52b26b380eb06f8763c154d5e36c54a5687bb SHA-256: c68867915a3577514374ca2df83f89f69a934443f6fa0b280c4a59b78ab88dd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to disposable domains, many of which are structured as link farms designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The document body, though heavily obfuscated, appears to contain a lure related to an audio book, suggesting a social engineering tactic to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=sana+tu+cuerpo+louise+hay+audiolibro+gratis+mp3 PDF link annotation
    • http://cafe-cok.ru/adobe_illustrator_cc_classroom_in_ag3rgd.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ion_profile_usb_turntable_software.pdfIn PDF document text
    • http://iwhite.space/foxyland_ps4_trophies12ufa.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/gas_laws_equation_sheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6010ff656645e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5feebd4608fdc.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/rjjhjce/best_free_ringtones_for_iphone_8.pdfIn PDF document text
    • http://899themes-demo.ru/bitlord_1._1_free_cnetpuq0u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_603658105d6d6.pdfIn PDF document text
    • http://fly-drive.online/gidute47ya3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fd115f8afc7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_6006f9c2bccb5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jgqjbjh/bunny_bookmark_origami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fea191ade9e4.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fender_mustang_gtx100_modelling_combo_amp.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/errvjdC/kivuzima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugumeb/is_aloh3_a_base.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/atomic_structure_inorganic_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/biogas_digester_design_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5996 bytes
SHA-256: 7175814131da0c1223e1e97ecc904f600def0b4cd159d44fa02d41cbd753c599
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11752 bytes
SHA-256: e75f7001ced890c78639888315957373cfb24ce384ebf4755ff4c3497fe30772

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