Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8989d936db7570…

MALICIOUS

PDF

82.7 KB Created: 2021-03-22 00:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e41adc863634eed078c72ffd0d4933b0 SHA-1: 8de3547bf5621632d8263d7e6d2b073402f60f84 SHA-256: 3b8989d936db7570faa869541548a4d97707bce23130ee1ae029302cf11916c0
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=aktivistische+investoren+pdf In PDF document text
    • http://juvugewit.iblogger.org/wogekaregejutupu.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/3413a.pdfIn PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/7143614.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/sIa8Eii/torn_meniscus_recovery_time_nfl.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/jh6CZid/12548122510.pdfIn PDF document text
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/bobaremirave-bowuxej.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/id0gfgi/raspberry_freezer_jam_without_pectin.pdfIn PDF document text
    • http://maykistore.ru/xulamimonugu1a9n3.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/pVjdQhd/helios_flight_522_accident_report.pdfIn PDF document text
    • http://dreamingdeveloper.com/free_converter_online_to_powerpointqiwlh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tevetozenirok.rf.gd/give_us_three_interesting_facts_about_yourself.pdfIn PDF document text
    • http://mowuxafidezori.epizy.com/how_to_know_if_you_are_above_average_looking.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/hvad_betyder_reformere.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/54510051924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b308cd7-ec3f-4691-bdd7-6ae4caa46212/82995347530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb63eec-010e-4fb8-b7bd-e632fffd27f2/add_and_subtract_fractions_with_like_denominators_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be62a794-c285-4865-acbe-21904145a31b/20055484828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9eae31-92e0-4f51-853b-9e5d4132b5c9/6844774847.pdfIn PDF document text
    • http://bepunemafozo.epizy.com/jakotofeli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 4900 bytes
SHA-256: 17d3ae7f0cceef436abaef00b153bd04e8f4365475c068d71b936481f51bd192
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 12776 bytes
SHA-256: 01d975e8c16bf850ef8d5b2b43448a8edefb4080784c016efe55d8e67714fe89
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361