Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ef102b9adfcb29…

MALICIOUS

PDF

89.8 KB Created: 2021-04-12 16:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39bfa12c41ec5f3571f22f85522b9607 SHA-1: c20fc07639ee85bea5873b00cfa231142791cc4f SHA-256: 63ef102b9adfcb29c8035fed2d3b57016fb77b92483d9522fe2c55ba36bf5887
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though corrupted, suggests a lure related to COVID-19 antibodies, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=que+significa+tener+anticuerpos+del+covid PDF link annotation
    • http://shoop-ff.ru/ensayo_argumentativo_sobre_el_covid_19fd0xy.pdfIn PDF document text
    • http://batut.space/cowboy_bebop_quotes_jethiagb.pdfIn PDF document text
    • http://reduslimitalia-official.website/7v7_soccer_tacticssjtsq.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/6961041.pdfIn PDF document text
    • https://kilizalulalikog.weebly.com/uploads/1/3/0/9/130969980/vibikokes_vagelapuri_litukit.pdfIn PDF document text
    • http://azalea.store/best_skyrim_mod_load_order_xbox_onezn2he.pdfIn PDF document text
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/3531939.pdfIn PDF document text
    • http://ketrovk.xyz/8655671478729yji.pdfIn PDF document text
    • http://tublitalia.space/artusi_oven_user_manualfng5t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_601a7d4e55ddf.pdfIn PDF document text
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/71acd7faf0d.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/sufilitike-xanene-nusuwi-debawusatu.pdfIn PDF document text
    • http://my-favshop.online/what_is_thermo_king0srp4.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/23893a4a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5ffa865faf3eb.pdfIn PDF document text
    • http://on24-system.club/178066126264sns2.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/d3ec168a-0006-4dfa-8c6d-a63b838f96a0/epson_ink_pad_reset_utility_l130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f999f67-9951-4c34-b2ba-7955568277cd/honda_crf_125cc_dirt_bike_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700b38ba-856b-4f94-99a9-692ecbf95bcd/tc_helicon_voicelive_2_with_vloop_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4053fe48-7a0b-4c59-8e24-10913a4c75ee/sears_table_saw_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bb9732-0fce-47c3-835d-35b3a5adbeb1/how_to_make_a_bunk_bed_frame.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_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 5444 bytes
SHA-256: c28bcc1b1ba7f7eadb608a52c60503435accdc9ca6c5cb194f0874ae51943df5
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 10928 bytes
SHA-256: 3d2ef15bb22b4eda8526f8399ed9da502e6e45e40ccb05d19ecfca473afddc9c

Open this report in the interactive analyzer, or submit your own file for analysis.