Malicious PDF — malware analysis report

Static analysis result for SHA-256 626e529486be501f…

MALICIOUS

PDF

63.2 KB Created: 2021-02-25 04:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 870c7ee3a7918701ac5472057a71ae81 SHA-1: 7df83b08af0b9c8f883366c77f311d391ccb3a8d SHA-256: 626e529486be501f1af07ff593cccfd2252701d83d9e3f69fded212a4766f69d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links pointing to suspicious domains, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to product pricing, suggesting a lure to attract clicks on the malicious links.

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/123?utm_term=poulan+2150+chainsaw+price In PDF document text
    • http://azules.ru/cub_scout_leader_book_2016s34vx.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/vapup.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/EJBhg5m/openttd_firs_vehicle_set.pdfIn PDF document text
    • http://fitness-ital.fun/3956143884807imv.pdfIn PDF document text
    • http://excschool.ru/vowifubobumagijajowezoxhhrnp.pdfIn PDF document text
    • http://xteenware.online/teleconferencing_in_education3x82k.pdfIn PDF document text
    • http://fishing-rods2.club/soccer_games_like_clash_royalegmx09.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/tisegovofu/holt_mcdougal_algebra_1_chapter_9.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/40592916524.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/53763105270.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/metric_length_conversion_worksheet.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_off0000bb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB32 5564 bytes
SHA-256: b4b49a0bc8591720c6e92e4367ea43e7e626a7e8604e393e12eb8ef88eb94e53
font_01_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 10016 bytes
SHA-256: 1fe449883be66c03a6af13f92d878be0c7e7c606060c6d5c0bfd59e62f0c9dd2

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