Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49591add0acfc72…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 03:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37f3e4ad898f4ec40e08a7a493506139 SHA-1: b82b0e4a67eba4aaedb0335ac668200662366f4f SHA-256: a49591add0acfc72f66fde0c8edfc0528f19b76c031f676eb6a1458b2a28f17d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://mezovuduw.ru/strik. No scripts were extracted, but the PDF structure and link farm behavior indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=beethoven+piano+sonata+op+106 PDF link annotation
    • https://cdn.sqhk.co/tivuzofep/3njcibT/samsung_print_service_plugin_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/A3hehi5/hack_cats_crash_arena_turbo_stars_appvn.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/Rijvibv/37842563981.pdfIn PDF document text
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/92ed05.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/gutefavusula_zibeveviloxuru.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/jalaxadilabetewu.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/5d4eac0c-5e4b-44e9-82ef-e58204778a11/xefogiriwagififidotu.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_7d0e6dd96ec3440a81b356b44b9dec82.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_bb26a2d703b842ab87fd509af3027f5d.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_dabd8f41eec64f44b3fffee556d920e8.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_71deec99d6ec4ca9aa721c979fc7c0f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc10232-8273-461e-8246-73d96ecfa820/klein_collins_tiger_belles_instagram.pdfIn PDF document text
    • http://kenizuz.epizy.com/mesamupiduv.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_b2bdcea42d4f4beaad05d890024c2ed7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f712ea21-18c2-4a44-aa65-b42463d83896/fafuruput.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_c2925cb6d3db4d949a640af7486a54ef.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_bfaa091ca36f4a9d933670645d4dfb18.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_54fd2a369a0147b7bacc533394fa784e.pdf?index=trueIn PDF document text
    • http://joratunezawaxa.epizy.com/imovie_title_templates_free.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_82d4b7114ce04f5cb4f7a7f571fc7458.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b306c128-9e40-4340-9762-704a94cbba1a/ninevimademedemeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5a03d5-5180-45fa-9a31-88c49f2e7959/jack_reacher_lee_child.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/chemical_engineering_thermodynamics_equations.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_558522ace8684379aa62c314e87d1f0d.pdf?index=trueIn 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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 5236 bytes
SHA-256: 37d1bcf7e40396a89e73a55d2fd2e1e3bde1c6b8e7289872f12e74c6b6a9ff4a
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 12248 bytes
SHA-256: 892f4925e65ad0b6424a5d7b54eb6ebb0c0a19e459f38b4b38526f518f8f0fdf

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