Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4960bb20c552fa…

MALICIOUS

PDF

95.5 KB Created: 2021-03-21 11:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a6e13b2dbd05486427bbc635db68c8c SHA-1: 27d125e95accf4d10a3a48c30dfae05952918cec SHA-256: fc4960bb20c552fa6bd6297b02a1f8896a5811503f169d30c8f2b96b025bc2fb
186 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. 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 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://xajibur.ru/strik?utm_term=best+books+for+yoga+instructors PDF link annotation
    • https://cdn.sqhk.co/josipinu/gg3RjjE/free_slots_games_for_android_mobile.pdfIn PDF document text
    • https://wavujosivisero.weebly.com/uploads/1/3/2/7/132740585/fopewigefomesujuvazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_60557b2461b2b.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/hihhY8S/ferejutegini.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/hijhgje/21861499701.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/jhjgThh/mazel_tov_definition_english.pdfIn PDF document text
    • http://ing-cliente.com/gatunogifupugebo6na33.pdfIn PDF document text
    • http://infonewsuk.site/astm_a53_free15595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_601235ef8b37c.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jehbjdK/blocky_farm_racing_apk_hile.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/pakirepos.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/b3b80e14bb28.pdfIn PDF document text
    • http://woodbonus.net/rocket_mass_heater_safetym2k0l.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/tkjhd0n/scary_sounds_creepy_sound_effects_download.pdfIn PDF document text
    • http://yandex-delivery.cc/wordly_wise_3000_book_6_lesson_9b_answer_keyi33lc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fdffde783028.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/relukiviwiletugas.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/sesagoz.pdfIn PDF document text
    • http://mail-autoscout24.net/12086360261qfxuo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 5372 bytes
SHA-256: 7cbd88cae70068912edbf997fcbe003607c76b8bd2e9991026e27fc7ce07bc19
font_01_sfnt_off00014894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14894 11364 bytes
SHA-256: ef6923eccdbbafbb8fb81dc12d0c40f1f7b34f3e74eed7802d9eabc3215887ca

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