Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5b1035056367ca…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 14:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fbf9eb632768d7eeddcc9245eb133278 SHA-1: 7f62cb5cb843c767f62f6c442c4c118a4d4498fe SHA-256: 1d5b1035056367ca87e72402daf4aa01f8bd568fddc177fc10ff1bdf2336a532
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'redox titration lab report discussion' lure, indicating a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/123?utm_term=redox+titration+lab+report+discussion PDF link annotation
    • https://cdn.sqhk.co/zalenelavup/Dhiiigh/60255307511.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/leica_m6_m7.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/Pg0hdJv/86780649677.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/8854358349.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/eFGei27/36240198550.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/buletom.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/jhbdjfj/party_city_promo_code_honey.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/ibjsNVQ/detective_conan_movie_23_cast.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/holmes_heater_fan_hfh2986.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/definition_of_economics_by_ten_different_authors.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/catalogo_inglesina_2020.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/redadanirupixanu.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/what_to_eat_with_severe_depression.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/9ae1c7fb-ca92-4d91-9c08-65bae4325654/tascam_dr40_manual.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/bharat_movie_song_webmusic._live.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_d49aebefbe514f4b8f29af249c1ab18c.pdf?index=trueIn PDF document text
    • http://leguliwopubagu.epizy.com/actividades_para_nios_de_4_a_5_aos_de_preescolar_para_recortar.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_b0326b3c065847b4b5d76dea3650e6ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0d2b76-b78f-46a5-a4ff-a1aa5f000f9c/9345850405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5d3216-0435-47e8-bbf0-1e5169c56efb/how_do_i_reset_my_whistler_police_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76780662-11b3-483a-a3ce-2b2158886783/origami_gift_box_with_one_sheet_of_paper.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/7283753375.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/37433521613.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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 3352 bytes
SHA-256: 15254d9bc15d4a81b25b50bcba715fb388e70931cb6e870922b7ab60b3c07ac7
font_01_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 5280 bytes
SHA-256: d93b47fde9a38e02546f8f6a604d9490d7c651b12593c842818761152d7be495
font_02_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 11232 bytes
SHA-256: daeeb2647be89e22e682675860312f67356103c6a12b11512bd7aeb24344fd2d