Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a93a4ed23f79a2…

MALICIOUS

PDF

89.8 KB Created: 2021-04-05 00:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f390ecdd6208c0dd8132f0b602ba9b2 SHA-1: abed4a54c4a792ebc6dddce89e8c81b1c6f700f3 SHA-256: 16a93a4ed23f79a2fa816b49869f55c4f15914a2abfd1e685e6bfb8a0e22e9eb
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 0.9996

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://bologen.ru/123?utm_term=calendario+de+vacunacion+2018+chile+pdf PDF link annotation
    • http://mastera-saydinga.ru/panasonic_microwave_inverter_spare_partsgp9to.pdfIn PDF document text
    • http://fallofelin.online/guidestar_platinum_participantfuu6o.pdfIn PDF document text
    • http://skout.tech/are_tv_remotes_ir_or_rfhixkc.pdfIn PDF document text
    • http://fito4ka.xyz/blender_2._8_beginner_tutorialevmi4.pdfIn PDF document text
    • http://talakam.space/bo_mzik_defteri_sayfas_rnei8463l.pdfIn PDF document text
    • http://omshop.space/viticulture_courses_new_zealand45stz.pdfIn PDF document text
    • http://begdas.space/wukoropukenibijajil7ts.pdfIn PDF document text
    • http://casser.xyz/do_wireless_keyboards_work_with_ipad_prop9io0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_600a45d3af38b.pdfIn PDF document text
    • http://detonic-ordina.website/gabutigupozidexuwe0t62y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463559/normal_5fe569b86b9c8.pdfIn PDF document text
    • http://invitesistem.ru/do_you_love_lyricsq0c9f.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/kazisimororeihmhx.pdfIn PDF document text
    • http://tugrull.com/xumufetitumasadevafn9xf0.pdfIn PDF document text
    • http://dreabling.online/7_habits_of_highly_effective_people_workbookw0f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370303/normal_60002fcb44b5d.pdfIn PDF document text
    • http://doweryklkq.space/fewudi7xwk.pdfIn PDF document text
    • http://huaweistoreukr.xyz/sp_racing_f3_mini_betaflight_setupxg33u.pdfIn PDF document text
    • http://leyloften.online/machine_learning_for_pythonjp147.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/ce7f0db3-0c92-473c-a5a1-aa8f70b1444c/how_to_reset_maintenance_required_light_on_2012_toyota_camry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c4c01a-fe43-4f1a-918c-d800083b3bea/how_long_should_you_keep_thermometer_under_tongue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca7ea0a-68f8-48bd-a497-ce9b761b5c5b/guferar.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_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 5552 bytes
SHA-256: b71e2a77b65de3e25ffb39d5b42ee0edd76ecf14e3e9605b3aa5af4c49dae9d5
font_01_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 12848 bytes
SHA-256: 27ef819568ad322fe33d8eb5c04d5bc4e42c6024bd2742736943b5661cf1faaf

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