Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a9bede9d99b909…

MALICIOUS

PDF

77.8 KB Created: 2021-02-22 05:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5b9bc7b3a0bb416a291f0b3c0f6f3da2 SHA-1: 8d86dc98e1f007fbb5b615890f3f6bbb93c662ad SHA-256: 08a9bede9d99b909f8ee0d96074c631f168d34afe7ed1ce124ca6e7f783aa4d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to disposable hosting and are presented as search results for common queries, indicating a phishing or credential harvesting attempt. The presence of external URIs and link farm heuristics further supports this attack pattern.

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=where+is+the+whirlpool+refrigerator+filter+located PDF link annotation
    • http://xujilutobidiko.iblogger.org/printable_pre_algebra_worksheets_for_8th_graders.pdfIn PDF document text
    • http://taxurofetizi.22web.org/charlie_wilson_s_war_full_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_600026aaceaf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5fd1ce9f5f701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486192/normal_6005de02e4572.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jjmGJWA/76340275556.pdfIn PDF document text
    • http://manekobe.22web.org/number_line_with_fractions_and_decimals_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6022d4371d1d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_6003dc8e3b04f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banobozibijur.epizy.com/definition_of_off_balance_sheet_items.pdfIn PDF document text
    • http://fukorow.epizy.com/karaoke_cdg_player_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/87922603833.pdfIn PDF document text
    • http://kitalanexu.epizy.com/mycoplasma_pneumonia_uk_guidelines.pdfIn PDF document text
    • http://fizufanotujo.epizy.com/computer_system_servicing_curriculum_guide_grade_9.pdfIn PDF document text
    • http://tesekinapoden.epizy.com/79686224403.pdfIn PDF document text
    • http://xegilejefaga.epizy.com/shimano_alfine_8-speed_internal_gear_hub_with_gates_belt_drive.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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 5520 bytes
SHA-256: 50fab4a0d1c19f6f28a19e8d453d24ba974fb7710c754f9bb43bd2b7b7bea42d
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10812 bytes
SHA-256: 98f79bd158e5b225a40b497f956121a67e5d2cfaa3d59c01feb5b57ffd2a30c3

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