Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbb95f24ef0f68a…

MALICIOUS

PDF

72.5 KB Created: 2021-01-17 12:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33c88acb642f46eb4ac9139311a4a538 SHA-1: 7b361e27b24de98c2924d8d95bae8ba8480d75db SHA-256: 8cbb95f24ef0f68adc559fa7a9e73f379a835b77c236b174d1d4aab866ca13b9
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=ultrasound+guided+barbotage+calcific+tendonitis PDF link annotation
    • https://site-1166687.mozfiles.com/files/1166687/clash_of_clans_update_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/00gigf0/death_from_above_1979_t_shirt.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/8145a5081d.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/XKZNHii/78819959254.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/lusivubug.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/chghagh/study_skills_classes_for_middle_school_students.pdfIn PDF document text
    • https://site-1173706.mozfiles.com/files/1173706/kamuse.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/fagixakegalilagosesif.pdfIn PDF document text
    • https://site-1176254.mozfiles.com/files/1176254/33636975437.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dXhhWic/talking_bird_mask_fiefdom_designs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitirinajeki.epizy.com/enterprise_4_intermediate_workbook_answers.pdfIn PDF document text
    • http://poxemibusap.epizy.com/rifex.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/k_p_c_l_full_form.pdfIn PDF document text
    • http://suvowafavij.epizy.com/digital_electronics_all_gates.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/herbivores_omnivores_and_carnivores_worksheet.pdfIn PDF document text
    • http://lonivone.rf.gd/barcode_scanner_android_phone.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/nuluxifasamijonijoja.pdfIn PDF document text
    • http://vepilezora.epizy.com/27561970389.pdfIn PDF document text
    • http://poxemibusap.epizy.com/druid_level_up_guide_5e.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 5320 bytes
SHA-256: 927a005328a713949728583c63f1880cc7cac5bb20c488df699ad95d30bd4a6b
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10696 bytes
SHA-256: 155449086374b3adc863a575b52a2526d7d6cc94e21c6a9310bb71975d2ad351

Open this report in the interactive analyzer, or submit your own file for analysis.