Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a7103f0c001410…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 16:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 91c584cbf955bdc0a61d21dac500058e SHA-1: 83322ad235f11a2a35e9f668794f79636f2a2395 SHA-256: 66a7103f0c0014107f66a5be332d532adb879465d03a68edd21b9c2ba8a170d4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a notable heuristic identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to stock lists and mentions wkhtmltopdf, suggesting it's a crafted lure. The primary malicious URL identified is https://mezovuduw.ru/strik, which likely serves as a landing page for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=how+can+i+get+a+list+of+all+stocks PDF link annotation
    • http://fejukoturig.medianewsonline.com/just_a_few_more_days_for_to_tote_the_weary_load.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/zomokatak.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/mubufibigi.pdfIn PDF document text
    • http://xodulik.66ghz.com/chrysotile_cement_sheet.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/what_is_an_isekai_manga.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/51795640934.pdfIn PDF document text
    • http://kimibifav.22web.org/redux_form_dispatch_blur.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/bunker_hill_wireless_security_alert_system_harbor_freight.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/wesefajonifobesiwiveliru.pdfIn PDF document text
    • http://zopijejezi.rf.gd/kingmaker_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/how_to_reset_honeywell_thermostats.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/jual_samsung_jitterbug_touch_3.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/kaverub.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/wegikumonukujavidori.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/breakfast_menu_template.pdfIn PDF document text
    • http://gozakovojuri.rf.gd/sas_ods_rtf_options_nodate.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/bobekeba.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/17185756370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b351ccd0-d392-4cc4-802a-663f1f34ac0a/joselog.pdfIn PDF document text
    • http://jupuzagap.rf.gd/pevidogetuvuwigokusoper.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/70540710053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e9c00b-b8ba-495e-850e-b6436c7c8d28/define_the_following_term_seasonal_unemployment.pdfIn PDF document text
    • http://levowemorunob.epizy.com/challenger_limited_annual_report_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4426e517-fe26-4ef7-b363-c760ef0a5b47/how_success_in_network_marketing.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_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 5072 bytes
SHA-256: 8110f0c96219a9e655baf905794b4f50ef09cae22802d910abe9afcae3fcb979
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 12092 bytes
SHA-256: 3b7dceac2ad7f94edd74d97334be8f152a53039f42d311aebbeb7fe15ae977f3

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