Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c99e08b77798d6d…

MALICIOUS

PDF

87.7 KB Created: 2021-02-27 05:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9c41aba9ec35bcc2d8fa0d462b814209 SHA-1: 50b7daab8d3b678e6067c2984e23524a8f1eb601 SHA-256: 6c99e08b77798d6d831e9999d5df7182fbfdf82f286b87239e73c1e5369e622d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/123?utm_term=do+you+have+to+read+jane+austen+books+in+order PDF link annotation
    • http://pafiwuz.66ghz.com/daxilapukegavusaf.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/is_waterpik_water_flosser_good.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/4472952.pdfIn PDF document text
    • http://stebsmeh.space/hot_rods_for_sale_in_alabama_craigslistlfkze.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/84388067398.pdfIn PDF document text
    • http://esportzmlevent.com/tm-ac1900_router_loginpken0.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/atomic_physics_download.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/how_to_use_a_whirlpool_thin_twin_washer.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/63058224490.pdfIn PDF document text
    • http://medicinfo.online/ludipetadamigarf7y4.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/mass_flow_rate_formula_for_heat_exchanger.pdfIn PDF document text
    • http://normab-id.com/awakened_house_of_night_downloadrrl8h.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/ravokumupir.pdfIn PDF document text
    • http://otomail.business/38050079122h15ta.pdfIn PDF document text
    • http://bekasopeli.22web.org/say_something_lyrics_sheet_music.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/lokipusegaxi.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/wuguzosepuzoba.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/dbb395732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://redikubegoda.epizy.com/9119577055.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/kitchenaid_stand_mixer_cover_diy.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/707687402.pdfIn PDF document text
    • http://risitikavaj.rf.gd/daxifikunalepare.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/gurawexesuwusotefowis.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/90736368906.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 5204 bytes
SHA-256: f2a8d9b48b25783ceba9f7575c5a46523ecf3c85ba97fd3824ea9d5ec0428e49
font_01_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 10704 bytes
SHA-256: 82eb551cf3f692fc1a277c2c955d8f6a0c22fce68189b44dc98ca8cc6a7a7bcf
font_02_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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