Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6acaab499e42da…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 17:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c5d65695ef74ab5b97a5b4aeb644f9c2 SHA-1: b5ff6e070431905048f406d84e686ef1211c9510 SHA-256: cb6acaab499e42da9e9de690084f15de5e0f4a80858eb7b645e7556d533a882a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged the PDF as malicious, specifically identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=mojave+road+guide+by+dennis+casebier PDF link annotation
    • http://wemexuj.22web.org/theories_of_human_development_in_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd37c45d3408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6033f416bf00e.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/importance_of_creativity_and_innovation_in_entrepreneurship.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/nFUjh7U/dinosaur_wallpaper_for_android_phones.pdfIn PDF document text
    • http://autoport76.online/set_top_box_application_formcwvjw.pdfIn PDF document text
    • http://tosufiloxosi.66ghz.com/internship_report_example_engineering.pdfIn PDF document text
    • http://bossyonlinex.com/gowepobufikagodufisavabe56t.pdfIn PDF document text
    • http://bogplaktnc.fun/how_to_change_battery_in_walgreens_digital_thermometeru22h4.pdfIn PDF document text
    • http://regse.website/71909223918l8ise.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/jenkins_dotnet_core_3.1.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/0ghWWjd/savaxizoxuwelopevuxaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_603d49b1ee48c.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/6999be4e-b6b1-473d-8b7e-ce0c5580ef48/bose_acoustimass_10_series_v_home_cinema_speaker_system_-_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeec89f3-5b1b-41cb-90ad-ada3feca6d72/how_accurate_is_a_winchester_model_94_30-30.pdfIn PDF document text
    • http://mejizemobimoli.epizy.com/literatura_e_resistncia_alfredo_bosi.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/places_to_drop_off_old_clothes_near_me.pdfIn PDF document text
    • http://kemaduxisi.epizy.com/36782540681.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/kubuponovinujakiwamabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ed8a71-9291-4ebe-a82f-7f8ee26a5dda/how_to_become_a_certified_barista_at_starbucks.pdfIn PDF document text
    • http://lafasusatar.rf.gd/angry_birds_2_mod_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13122df9-3333-4fc9-832d-85d1a5507195/jepekumifofepibobag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a32a83-99f4-4bb1-90c2-ae8917721a3e/atomic_physics_books.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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5460 bytes
SHA-256: e3978bfe6595eb46d813224411f62c9ed536d180b21a9c7294d17bd0f91fbb99
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10668 bytes
SHA-256: d9b75ab69a0af7740692e64121e9cdd5cd3f218f9789ee90b6a208f55c22c73b