Malicious PDF — malware analysis report

Static analysis result for SHA-256 5519d3da71cd4f5b…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 14:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 71025fbec67947e9e28a95e698f177c4 SHA-1: 8584b474c79ab37d410e3afcba21737267cff218 SHA-256: 5519d3da71cd4f5b30bbbceead90971ce8dea47395af8d7970fe6c85014855e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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
  • 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://lozipotod.ru/strik?utm_term=strength+training+program+for+menopause PDF link annotation
    • http://topcreditcheck.info/what_is_information_technology_business_informaticsq9one.pdfIn PDF document text
    • http://verifybadgesbusiness.com/nupiwodirejaxoxeterktl5.pdfIn PDF document text
    • http://hook-up.fun/93334765470qomnf.pdfIn PDF document text
    • http://cashfree.store/bivetoxels3kwn.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/kiniguzukorir.pdfIn PDF document text
    • http://kapusta.pro/pedagogy_of_the_oppressed_study_guide925ea.pdfIn PDF document text
    • http://ita-bio.space/buvufilapohuubl.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/41985585114.pdfIn PDF document text
    • http://converstarget.ru/ribodexixutamokevaritonp1e3a.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/basic_excel_formulas_tutorial.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/simple_html_and_css_templates_free_download.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/mokixetat/grapecity_activereports_for._net_12._0j_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7161d29c-2b75-455f-8c97-b3657274dd73/kufufurumo.pdfIn PDF document text
    • http://gogotefabup.rf.gd/partnership_deed_bangla.pdfIn PDF document text
    • http://dasufolizimifub.rf.gd/56031354008.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/how_to_replace_battery_on_ipod_classic_30gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c9f40b-17c5-43e7-8849-64164c5eced9/integrated_chinese_level_1_part_2_workbook_answer_key_lesson_16.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/balao_da_informatica_jaguariuna.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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5388 bytes
SHA-256: ac7694c83b4636e76be88f689378a42c4337900a9005f2c7a1129dcae171c88a
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10404 bytes
SHA-256: 7641165803081f8fd42733b849ccdae6fa2173ebd45b1eff4c474b5bc0d40b5c