Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6126b3e7549f4…

MALICIOUS

PDF

100.7 KB Created: 2021-04-19 18:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f63afde5fafef14c52c1578c41b236e6 SHA-1: d94349be261e6b9866318850689dd1deda5d430b SHA-256: 3bc6126b3e7549f4123b55f4dbe3b4bbc24537d1e618d5d731ee9bf17449f7fa
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL, 'https://jumiwimov.ru/strik?utm_term=calculadora+de+integrales+triples+wolfram', suggests a lure related to a Wolfram Alpha-like calculator, likely to trick users into clicking and potentially downloading further malicious content. No scripts were extracted, but the PDF structure and URL strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jumiwimov.ru/strik?utm_term=calculadora+de+integrales+triples+wolfram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483842/normal_60257d2b8cdc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fd379fa8c8e8.pdfIn PDF document text
    • http://xabusiwidurej.22web.org/introduction_to_automata_theory_languages_and_computation_pearson_education.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/jiOicia/hku_msc_food_industry_management_and_marketing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384318/normal_5fcba870a89b8.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/zU0WJhf/chromecast_built-_in_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/eBghaih/skylanders_characters_swap_force.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/bohiADK/avg_alarm_clock_xtreme_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_6041181138345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_601e640a1d1b7.pdfIn PDF document text
    • http://repefokuxogefu.22web.org/apk_caustic_3_pro_gratis.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/60b7b9e8-d356-4e7b-a788-1cf9abafddc6/bubimoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1283a58-db10-4cef-ad45-1d8c89c59adf/garmin_s60_leather_watch_band.pdfIn PDF document text
    • http://doroxepazu.epizy.com/39755880437.pdfIn PDF document text
    • http://zelagipu.rf.gd/descriptive_writing_lesson_plan_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0213b5-77c5-41c9-94b9-2aaf5ab529b4/punugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85f82f3-9c66-42ee-9b80-8f613aac57f6/verifone_ruby_ci_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fb368d-8224-4b2a-90bd-bea664f5399a/xegobe.pdfIn PDF document text
    • http://disefubukub.rf.gd/55531577200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4886170-7837-472f-9e07-d135c197e0d9/61255261173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc49ac3-fecd-4994-85b9-d7559dfccc45/how_to_use_homage_microwave_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d439f5a-8ba3-4b4d-a5a9-1d18aa499837/fusomotatazer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a57249-0dd2-4079-ba5e-97af2a2bd025/58226835027.pdfIn PDF document text
    • http://papumubi.epizy.com/boss_full_movie_2013.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 5472 bytes
SHA-256: 133e673205e3d792f305f1e5c2920afc234f5439888ca3e0703e0f6579c4db91
font_01_sfnt_off00013df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF1 14532 bytes
SHA-256: 5808814b56f1fd427c604fee42e546445c23eab33ae4f42b72456774c3fd3beb
font_02_sfnt_off00016de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE7 16140 bytes
SHA-256: 18da1b42559c0b17bc661aaa6c7ef178cea16dc39b676604e806222435b953cd