Malicious PDF — malware analysis report

Static analysis result for SHA-256 b816a52df4b1ac78…

MALICIOUS

PDF

80.8 KB Created: 2021-03-18 09:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e4164ab10c771caad937230f9930b9e SHA-1: e3090fbb9c8029bb72099950004dd043eddc265b SHA-256: b816a52df4b1ac78cbc9502c570d2cf532bbbd5191f52bc4312136f57d52aed2
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 0.9994

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://gimoguvi.ru/strik?utm_term=guia+de+trofeus+dark+souls+3+ps4 PDF link annotation
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/160040.pdfIn PDF document text
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/d28818a1b.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hbjf0jb/93706247479.pdfIn PDF document text
    • http://bonusiotsbera.online/bosch_classixx_5_user_manualevud3.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/tudejawedavovof_kujodu.pdfIn PDF document text
    • http://lighterusb24.site/how_much_is_a_monthly_membership_at_lifetime_fitnesssuvls.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/1035482.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/zinomisuvunuleweza.pdfIn PDF document text
    • http://mailedflkf.site/17931469783s4xb1.pdfIn PDF document text
    • http://triple-doska5.club/do_you_cook_jewish_brisket_fat_side_up_or_down9poci.pdfIn PDF document text
    • http://oneitstore.info/7471327449x7yny.pdfIn PDF document text
    • http://talinab.iblogger.org/66066722556.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/jgi1mif/51267770361.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/fjhhh61/download_kast_watch_together_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/195b4b8d-4acd-4037-bb92-be8e63a4851c/the_missing_season_1_episode_4.pdfIn PDF document text
    • http://mupegutiwigo.epizy.com/cuanto_vale_un_metro_cuadrado_de_pintura.pdfIn PDF document text
    • http://nibejodawugizex.rf.gd/why_is_my_kwikset_lock_blinking_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e1fdb2-7bd7-4a14-adce-2168fecd2747/how_to_do_a_4th_step_fear_inventory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b990a66b-1fb0-4a43-a99a-c9152bd8b28e/traductor_ingles_espaol_con_pronunciacion.pdfIn PDF document text
    • http://pulawev.epizy.com/xulujovobuberabebe.pdfIn PDF document text
    • http://zukuvib.rf.gd/ludebikul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b891c5c4-0028-4b14-83a8-072d811eb979/ritoxezifutulojubifejowab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48229a7-e7b7-4b85-831a-6488d2d2a87e/3164683662.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_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 5384 bytes
SHA-256: a3c5827b7e73205baebc50f6abe152f0c4095718df0652ed9ae15084ef6d15bf
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 12908 bytes
SHA-256: 9f7c61a85f002e3975d87c73cc4ac6227f62bdd2ff2621129fadf6a3cb03a2c2

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