Malicious PDF — malware analysis report

Static analysis result for SHA-256 def694bb08c58010…

MALICIOUS

PDF

102.0 KB Created: 2021-05-02 08:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a1a1dd904a39a43c2e515530aa829be6 SHA-1: 5033960ad16b4aae300870bdc838e0b4a35606c8 SHA-256: def694bb08c5801049c09dd6c92c1c078f223a4365c2b002bc666d10fabff6f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=inkheart+book+synopsis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd15b3fb9adf.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_6065f0f327be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_604719157f53f.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/human_anatomy_and_physiology_lab_online.pdfIn PDF document text
    • http://crysety.xyz/3744393557pl3dp.pdfIn PDF document text
    • http://zebizadojol.iblogger.org/42049254344.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/gubimokunimufutar6upx.pdfIn PDF document text
    • http://ctuxuu.com/cl_blends_worksheets_free7x9xz.pdfIn PDF document text
    • http://namsinc.info/ingenuity_travel_swing_weight_limitk2k0o.pdfIn PDF document text
    • http://everydayy.fun/25219179063ipdmf.pdfIn PDF document text
    • http://weroserigo.22web.org/electron_configuration_worksheet_year_10.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/96145858280.pdfIn PDF document text
    • http://purigoguwoz.22web.org/megan_fox_transformers_bike.pdfIn PDF document text
    • http://indir-kazan.com/xexebofapuxanlv2ml.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/xipesi.pdfIn PDF document text
    • http://fufifaramulemi.rf.gd/work_permit_form_md.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
    • 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_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 5120 bytes
SHA-256: 173bf2680d1cfaf0492db69cd263174127152d067463fb40f3f527d32aef6bcc
font_01_sfnt_off000151a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A5 10568 bytes
SHA-256: 0036071eed26b74fdb11d1d3c3d0e176a354082331b29a5823c0af8649aff65a
font_02_sfnt_off000175d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D2 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501