Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ed33a4d12e8e3e…

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 00:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 43401c532f694481ce76123f85a246eb SHA-1: 9062c149d7c06b8908767361764867ceb5eecb5f SHA-256: 92ed33a4d12e8e3e24438c17fabbf2285591ffeb8a4057f6c45894585c9a557b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=fax+cover+letter+template+word PDF link annotation
    • http://natezaka.iblogger.org/how_to_see_google_location_history.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/jdCG8sK/history_of_noma_christmas_lights.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_6059b0bbe3371.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/ijjijis/91309496300.pdfIn PDF document text
    • http://nomokosu.iblogger.org/smartsheet_gantt_chart_hours.pdfIn PDF document text
    • http://rugavup.iblogger.org/ladawusakijubufovuditonul.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jiigoT5/part_time_project_management_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/c1jjkhf/shop_disney_parks_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/Sfqqjdb/nikah_in_arabic_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_603bab0a51e09.pdfIn PDF document text
    • http://bimupodum.iblogger.org/chemistry_formula_table.pdfIn PDF document text
    • https://cdn.sqhk.co/nonebizi/tZtjbXB/aifmd_article_42_reporting.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/3RxigoY/dragon_nest_goddess_statue.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/qkLhdKP/making_cake_frosting_at_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotisonuli.epizy.com/2016_mazda_3_android_auto_retrofit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80ded0c-c9bf-4350-a58f-a34c5044fb14/ireland_phone_number_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc75249-f078-4cee-8827-9b54747bfa14/xulemox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595e6ac0-c07f-4b0f-8f92-a3c68aee03d4/how_many_calories_in_lettuce_and_cucumber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5bdc34-1861-419d-b323-435ce3455a24/what_is_the_importance_of_text_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665f77de-f356-4160-9520-e6e1ca01bd8c/70569331056.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5216 bytes
SHA-256: ba38b8c85e789927ae872e125527df23628f8afb113812020352c65c10db1c36
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 11032 bytes
SHA-256: 68701da6774352c64949fb395fb0ff7c589f5dab9ea8729d40717c0f4072caa4