Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb8fbb891e60bd8…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 19:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 97afe875631bcf9dda3c554e4233501b SHA-1: 105c2b612e64439e6466d15c7bd800f9491f4c67 SHA-256: acb8fbb891e60bd82afad36230c9ad584bb160f39931a52a3c4fba031ca0cf19
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. 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-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/strik?utm_term=what+does+seeing+22+22+mean In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_60535c56159de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_6004e1f741e69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_6000be7a18050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495685/normal_605ab95c16000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_6010b3b7106ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6039169760f85.pdfIn PDF document text
    • http://zabozukatipu.iblogger.org/what_does_sunshine_in_my_pocket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fd65afe30204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_6048cc0b18f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_60498b345dedb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_600808eb4028c.pdfIn PDF document text
    • http://tolosoludoxol.22web.org/how_atoms_in_a_compound.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11514534-9699-45ab-adec-164e8265a50f/plantronics_c052_headset_instructions.pdfIn PDF document text
    • http://boponewutizubi.rf.gd/33562131589.pdfIn PDF document text
    • http://jonesunomipavi.rf.gd/champions_league_group_stage_fixtures_2020_19.pdfIn PDF document text
    • http://mowixir.epizy.com/4to_convenio_de_ginebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480833e5-d929-4b45-921f-645971b79aed/does_arctis_3_work_with_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ed7014-b5b6-4e21-a98c-3df8d7aac99b/live_life_lives_difference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6912b7-f539-4a8e-8d88-d25eaa2fe6af/horus_heresy_game_review.pdfIn PDF document text
    • http://dibulazovila.rf.gd/bakegabororibonikupepuw.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5256 bytes
SHA-256: d289b3dfd925003352184159a5fb36dcf0937c6a5af86a0de8612e889d414102
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 11068 bytes
SHA-256: 817c2a0c0500cd8fb9db0aebdf8be836a7dcaf65a4c799b6dd878257e7b350c7

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