Malicious PDF — malware analysis report

Static analysis result for SHA-256 763b0d5eee51a2f7…

MALICIOUS

PDF

84.8 KB Created: 2021-04-11 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ffc027bfa6f540302393257de0c067f7 SHA-1: 599cb215cb40f7a34976eef171d9284538838282 SHA-256: 763b0d5eee51a2f794ebedbb555b052f07283186004ada33549834deead93985
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://nipisod.ru/strik?utm_term=how+to+change+samsung+water+filter+cartridge PDF link annotation
    • http://fortuneo-enligne.com/formato_de_tesis_normas_apavdy0s.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/e2feb9b7fcfad.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/cheVrca/40691653758.pdfIn PDF document text
    • http://momentikshop.space/star_trek_technical_jargonsr70h.pdfIn PDF document text
    • http://italywow.pro/wire_diameter_calculator_dci9j6f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/VPRGu6D/top_10_kingdoms_in_the_world_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lexujowina/eIjjYgh/mibobesak.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/zipesexorerod-falaxibiwej-bofepuba.pdfIn PDF document text
    • http://vulomufukuvi.22web.org/low_calorie_snacks_for_weight_loss_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/bogivinon/iijhcG0/xapitajogujujumowize.pdfIn PDF document text
    • http://sunny-web.ru/a_street_cat_named_bob_netflix_malaysiazurom.pdfIn PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/xesujob.pdfIn PDF document text
    • http://cleaner360.shop/a_scanner_darkly_streaming_free7e1al.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijikipemed.rf.gd/judekofadazamulazidanagok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b709e0af-9f02-40f8-ab38-663e3b20227c/black_and_decker_drill_12v.pdfIn PDF document text
    • http://katetafixogigov.rf.gd/kwikset_smartcode_916_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4719431-6f62-49fd-817f-bd675d1e1dcd/nowiruvadatizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0de8f81-876c-45db-9e8e-685b7c91a124/68975047561.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_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 5488 bytes
SHA-256: 7b7121dd2362c88d444d8a44fd24b51caf4be30cd446f148eed7a4051a60cddc
font_01_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 10716 bytes
SHA-256: ca680f3548f91a41e72a48ded48e4bdf11938990bc0ac0fe47bbcd17c3ed2678

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