Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d03535c0757a9d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-02 18:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b50991e661e9839e7d5dfff0eaba27a SHA-1: 35c6a1a0637dcccc5f54c3acdba808c418466ea2 SHA-256: 28d03535c0757a9d959b00c27be2e871addb20900b96c7262ecd5ff1ff2de973
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=brother+hl-2280dw+toner+walmart PDF link annotation
    • http://nakodinita.scienceontheweb.net/2019_ford_mustang_gt_premium_top_speed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5ff3762ce4ebd.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/jasugodasoma.pdfIn PDF document text
    • https://gedibaforajipet.weebly.com/uploads/1/3/0/8/130874683/1156326.pdfIn PDF document text
    • http://ptmonline.ru/385042670112lhxy.pdfIn PDF document text
    • http://fakaripeti.xyz/analyzing_irony_in_literature_worksheetlpd1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_603cf3bb6e4a6.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/xufolubabezilave.pdfIn PDF document text
    • http://sewulege.22web.org/mujatixuwet.pdfIn PDF document text
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/9705936e.pdfIn PDF document text
    • http://girlita.space/aubasa_factura_electronicap2xtv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_603d9a3c51ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_60135cda3c2d4.pdfIn PDF document text
    • http://yandex-dostav.ru/occurrence_book_formatgkvi6.pdfIn PDF document text
    • http://kexopef.iblogger.org/75455238577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/application_deadline_for_texas_am_san_antonio.pdfIn PDF document text
    • http://zevomes.rf.gd/best_alternative_to_tv_ears.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/how_to_calculate_unit_cost_of_product.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/4787491985.pdfIn PDF document text
    • http://tamakibegotilo.epizy.com/grobag_tog_guide.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/gunonokizevuvafamijuzex.pdfIn PDF document text
    • http://gulabuj.epizy.com/nikon_dx_af-s_nikkor_55-200mm_f4-5.6g_ed.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 5528 bytes
SHA-256: 3ec82233597672a857911c37b851ee47f10981331160b6de593609ca2574b746
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 10684 bytes
SHA-256: 0c5b92b6255a6531e83f3e8a4abbb723c63aa853b6c9c3091a46021f1f5b1a81

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