Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f227cc344660cb…

MALICIOUS

PDF

73.6 KB Created: 2021-02-19 18:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 37dd7040df3cfd77083150161ba594d4 SHA-1: d07fb9477d4454b9063070b86cbce384a5d99dc6 SHA-256: 38f227cc344660cb2d01181bb037ce9f98cc59afce9b398d5ccefa62d96d24fe
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 0.9998

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://baarspo.ru/123?utm_term=what+are+language+milestones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fc88d7a589bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60136839babde.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/qwPijic/dr_reverson_gastro_rio_verde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fe7e2e80a762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_6013ab08565d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_602c256874eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fe3e400e78b4.pdfIn PDF document text
    • http://zexofezureza.iblogger.org/mcculloch_3200_chainsaw_carb_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/4WQipkL/nfl_football_training_camp_schedules.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/jiMl6UY/18535863734.pdfIn PDF document text
    • http://berozava.iblogger.org/11885499930.pdfIn PDF document text
    • http://ximuvitu.iblogger.org/tewamalezibotig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_6021787dabc7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezuboteseg.epizy.com/16507540308.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/acrobat_reader_6._0_professional.pdfIn PDF document text
    • http://lamumabazekutum.epizy.com/comparison_of_adjectives_exercises_worksheets.pdfIn PDF document text
    • http://zutotakome.epizy.com/98919354642.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_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 5112 bytes
SHA-256: ad4206bf86b3c145b9b3f9e12c35d80094ea520b096203790c70fdd61d422621
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10356 bytes
SHA-256: 44f0f7a0fc7c4e0e605bdaca45dacc7ca6c30ffae632789e69a7281b32a851a4

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