Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ffa6652ac3dbdd…

MALICIOUS

PDF

90.3 KB Created: 2021-03-17 01:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e06389ff1272bfd90fa8e20afce9549f SHA-1: 540246832559190f0972bfd99e3e73ac6d415a47 SHA-256: b4ffa6652ac3dbdd6d1395b18de14b7aca6320ca72161699c0cc9200030de28d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://resalured.ru/strik?utm_term=what+is+the+meaning+of+desktop+publishing PDF link annotation
    • http://bratskpravojur.ru/which_excerpt_is_a_counterclaim_in_what_to_the_slave_is_the_fourth_of_july_quizlet1271t.pdfIn PDF document text
    • http://fakts.design/jidorenagopegufivilifgdb4t.pdfIn PDF document text
    • http://totumaxotudi.iblogger.org/85159931102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5fc7653163751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_6006cc8e42bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601e0a5dc470f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5ff1aec09dba3.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
    • https://s3.amazonaws.com/xovekolamoxe/family_tree_templates_5_generations.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/stock_market_open_monday_presidents_day.pdfIn PDF document text
    • http://pixibirorak.epizy.com/79233954226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41e8d45-0a70-49b1-8f94-eb12955ba409/vigenugafes.pdfIn PDF document text
    • http://dokaxemimagi.epizy.com/adolix_split_merge_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413c72df-2dba-4f59-8959-9a9a1ef9a97f/wefofatenuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ace9c89-3125-4456-99f9-14f7fd4243d4/how_much_is_samsung_tv_32_inches_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34432738-47ad-4bec-a9a8-23b9c0fdf51d/what_do_you_mean_by_designation.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_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 5460 bytes
SHA-256: ebdbfb092a976d87a1805b2856b44748e341a2c5ee4a8ef3cb1f7e8dccadeaec
font_01_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 12256 bytes
SHA-256: 096e2412917cd91c02b72e60fc0c8870c632e87489e383529032365c9f48539b
font_02_sfnt_off00014c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C58 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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