Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dac9fcf639bcb5e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 09:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb8a8210b74b21e5b702e9226d67b14b SHA-1: fa3163e871644e1351cd9c58d807ff288fca89b1 SHA-256: 2dac9fcf639bcb5e69b8484b53bce7fd613d1d22ee2251742f0d98ad5ca86855
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=con+duong+viet+nam+lyrics PDF link annotation
    • https://cdn.sqhk.co/kewudomavave/jhyLdHN/diced_menu_nutrition.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/designing_data_intensive_applications_filetype.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/juwedesasivefo.pdfIn PDF document text
    • http://yarrebitteh.online/frigidaire_oven_cfef2422rs_manualvwimk.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/g63ghA4/wazarepidemozoti.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/Mgec7jh/online_business_card_template_creator.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/bO6jeds/49187975828.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/7jfwuid/barbershop_2_cast_members.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/tajudax.pdfIn PDF document text
    • http://petrol-v-pol-price.site/how_to_pass_the_drivers_test_in_missourismo3w.pdfIn PDF document text
    • http://krokoboko6.xyz/the_dear_hunter_discography_torrentuh1ls.pdfIn PDF document text
    • http://seamanygau.best/databalugotild09nk.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/8Iid3jg/luzekusujajigaxita.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/what_are_all_50_states_in_alphabetical_order.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/hjhahhQ/85436380361.pdfIn PDF document text
    • https://zutomufafet.weebly.com/uploads/1/3/1/6/131607254/6071858.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/eBjagfT/tazotenil.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/Lkehcjd/23283794041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxujewov.myartsonline.com/4th_grade_math_worksheets_simplifying_fractions.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/jemufawen.pdfIn PDF document text
    • http://jazopizebe.atwebpages.com/attainment_test.pdfIn PDF document text
    • http://fabevax.myartsonline.com/bach_goldberg_variations_piano.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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 5324 bytes
SHA-256: 349700a431040603c4079e5bb6005c06579a3514353598dc5aa3c9f0525f083c
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 22592 bytes
SHA-256: 761d6f7b29e81e6b888993c4a3ed179433c23a8dc6d89ea3ae0592572b439023

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