Malicious PDF — malware analysis report

Static analysis result for SHA-256 b825e9ee763ef790…

MALICIOUS

PDF

79.3 KB Created: 2021-05-05 17:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c6410401d92b06c649f13700f0844eb SHA-1: 8b95211a4b9d2aa500fc3850c86e069a3f642615 SHA-256: b825e9ee763ef79067afa1a9eb67acae105c9090598cde833a72447fc1f828d7
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://crophysi.ru/strik?utm_term=what+are+the+benefits+of+working+for+apple PDF link annotation
    • https://cdn.sqhk.co/pevizopubok/jfPvoif/ultimate_forest_simulator_apk_1._0.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/l2FcaPL/evaluating_quadratic_functions_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_601391926044c.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/kusimedelipapa.pdfIn PDF document text
    • http://lighttravel-ng.com/fizasigasoluvulifipinaj4r74q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_6059e239da14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fd376a3cacbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_605126eae8247.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/7iaheib/speed_motorcycle_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_604d48a0b23bf.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/RN9HgcN/23074490172.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/bihar_si_previous_paper_download.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/bart_transit_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6033a45098eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_602620397d727.pdfIn PDF document text
    • http://stepka2016.xyz/erb_palsyzpp0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_602c82cb5e93e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5feb40e6295c0.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/galeviletunivitidatozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_6000822884dec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 5472 bytes
SHA-256: b0f235c9098efa7923dde7be3d392eb1e69e2df64353c21ac935d91745b2177a
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 11568 bytes
SHA-256: 108476a3913b6a2aa2c70fe1e4c997bca06df7d6941b5bc25148cd9425d3aaf3

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