Malicious PDF — malware analysis report

Static analysis result for SHA-256 691a5d42ba7bd9bb…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 21:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e82a841e0d30b3ee0b229c22c7027153 SHA-1: 5d28403d3338f9d1af8482a95564e10b174ac165 SHA-256: 691a5d42ba7bd9bbcef962cbc8b9349b2cdf4870f18181ea94ad3cea02d40bb8
164 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. It uses an invoice-themed lure. 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 0.9993

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/strik?utm_term=journal+format+class+11 PDF link annotation
    • http://rm-swis-mine.com/2013_dodge_avenger_thermostat_housing_gaskethc7o2.pdfIn PDF document text
    • http://study-english-05.site/islamic_marriage_contract_templatekjtkz.pdfIn PDF document text
    • http://immorta-cross1.club/727805214fl70u.pdfIn PDF document text
    • http://silver35.ru/spring_boot_framework_version_historyvceu2.pdfIn PDF document text
    • http://vandify.com/cv_administrateur_systeme_windowsftkrg.pdfIn PDF document text
    • http://mazovun.iblogger.org/70310542292.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/27730549472iod6r.pdfIn PDF document text
    • http://tertov.xyz/zavadugenurelipevunedetiz73in0.pdfIn PDF document text
    • http://generalmassage.online/tres_metros_sobre_el_cielo_subtitrat_in_romana_partea_3en239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_4a396eeeb2de44a3a78dc416b75fd711.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogonof/zivubepe.pdfIn PDF document text
    • http://lipifif.epizy.com/30369541995.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_963d1d0c500042b9871e1e852f557640.pdf?index=trueIn PDF document text
    • http://xesidif.epizy.com/hp_officejet_7110_wide_format_network_a3_inkjet_printer_with_wifi.pdfIn PDF document text
    • http://zoratazux.epizy.com/65746743885.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/boxupuserosulufowixifanu.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/writing_equation_word_problems_worksheet_chemistry.pdfIn PDF document text
    • http://jevusavisa.epizy.com/culminating_performance_task_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/54677816654.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/sogudawofujez.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_7b88124aab344c77930d47b721a8763b.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_9d318425db564283a3a86e7311943739.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/golusarasoxupofibigo.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/vafetoporodowogenatenome.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_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 5068 bytes
SHA-256: 772a8695a1494fc2181111b8108f1e54504ff64b686e3bf24ca962cecc1f0f95
font_01_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 10960 bytes
SHA-256: abb21a586767c1a49eb80ef7c915b48b3d4c29181bb20d7de4dc2a749c217c87

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