Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06aaf84e6633910…

MALICIOUS

PDF

76.6 KB Created: 2021-02-27 19:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4aa5f24e64e1e99b14d89a924a9a94d7 SHA-1: ef43cf2abdc905e2bca09d83d4ad58cbb503b443 SHA-256: e06aaf84e66339103cdf0e666ad1ad00ff63fd9b7e7a379641348a777ebef7cb
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 an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host a malicious payload or redirect to a phishing page. The PDF structure and embedded content suggest an attempt to disguise malicious intent.

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://mezovuduw.ru/strik?utm_term=himno+nacional+de+honduras+todas+las+estrofas PDF link annotation
    • https://cdn.sqhk.co/sowojusawepu/igfgjje/ralolawapa.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/jwgdrib/average_cost_of_obamacare_for_family_of_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_603040d3988b2.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/dexikep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_6015b9e45c8b5.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/UKlBhgz/how_to_use_robux_calc_for_roblox_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/KjfYhhO/95511504831.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/Gghjfbm/square_enix_software_token_emergency_removal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/macos_catalina_clean_install.pdfIn PDF document text
    • http://tefabawamibane.epizy.com/wugexeloxezom.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/star_trek_generations_script.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/46479053862.pdfIn PDF document text
    • http://pasazaxara.rf.gd/93888769530.pdfIn PDF document text
    • http://bojuzafi.rf.gd/archdruid_lunarwing_form.pdfIn PDF document text
    • http://kesaratesur.epizy.com/srujana_audio_call_recording.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/puzipujugukivakegi.pdfIn PDF document text
    • http://duvexarido.epizy.com/adecco_group_annual_report_2008.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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 5220 bytes
SHA-256: cc8a14ca04c85d08298abb1f0652f37d9a2f3d0cf0f10810a53fc99fc380d019
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 11780 bytes
SHA-256: 5b2918a0d2d512990d04e71e10eca5dddc80ea99a6e0c3205ff14633fad0a3e1

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