Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b0dea771df4625…

MALICIOUS

PDF

86.3 KB Created: 2021-02-20 01:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90227e4091310d50dfbecf81202fc19a SHA-1: 410a9db7d9a371156fe98d0a41522e2fb750ae2c SHA-256: 74b0dea771df4625ac769419628fe38162a8db75f499025d4915a4cfefa8a8d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting it's used to redirect users. The PDF structure and embedded links are indicative of a phishing or credential harvesting campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=2020+sat+dates+college+board PDF link annotation
    • http://anstel.pro/gojolavibedaradudoksp0bi.pdfIn PDF document text
    • http://dezlice.ru/nellcor_bedside_spo2_patient_monitoring_system_manualpv31z.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/sudotuvalobovelegcxry2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489839/normal_5ff4c88365331.pdfIn PDF document text
    • http://hot-money.fun/gemuzikuwinobaradogfqdqc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_602daa872e89f.pdfIn PDF document text
    • http://mexicotop.xyz/suggestion_box_form_word_template8ubzs.pdfIn PDF document text
    • http://present-mag.ru/ice_hockey_dallas_stars2z1c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6006bf2827f60.pdfIn PDF document text
    • http://fastgetme.online/motadovodugugateripuxbcx3w.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/iHYheid/dinos_online_mod_money.pdfIn PDF document text
    • http://hustlinmoney.com/abirami_anthathi_with_meaning_in_tamilbdei2.pdfIn PDF document text
    • http://ionatr.fun/lunubawazojamavamukaliriq1pma.pdfIn PDF document text
    • http://detonicro.website/lands_end_uniform_store_austinxbn5j.pdfIn PDF document text
    • http://ufenmac.com/organizacion_de_una_empresajox1p.pdfIn PDF document text
    • http://prodit.space/3742329226559d4f.pdfIn PDF document text
    • http://kino-vezde.ru/bts_idol_intro_performancewnzvk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://garapaf.epizy.com/kolagerivadirajonalevowa.pdfIn PDF document text
    • http://tebexuvizo.rf.gd/facebook_login_android_get_email.pdfIn PDF document text
    • http://nolerepegumadoz.epizy.com/calendar_2020_singapore.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_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 5424 bytes
SHA-256: e0130b66a7ad73db62be87f5602fc4af117ffd7ec6bb491fc93043580afc65f5
font_01_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 10592 bytes
SHA-256: f63a709e656a4b3810541ed11104c7671971d199b1175942a9b9b9477880eaa4

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