Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9480bd10faeb22…

MALICIOUS

PDF

66.4 KB Created: 2021-05-14 15:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7c4c56c11b8210079bb6c41c43484610 SHA-1: bb1e5e1338b6b91a3e54fb5dcb8d590cd145e135 SHA-256: 8d9480bd10faeb226252ab8d9b78dff0ba605341c25e336f94a43ccb499255a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata related to its creation, but the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=50+shades+of+gray+3+songs PDF link annotation
    • http://samoe-samaya.ru/calcular_funciones_trigonometricas_sin_calculadoraqt7i2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5fd95dbd55c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601308a50a6bc.pdfIn PDF document text
    • http://stopro.store/87301009730j3m8m.pdfIn PDF document text
    • http://betmoy57.com/sig_sauer_p320_holster_with_lightwv8xv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fd199d82db4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_601d73adb181c.pdfIn PDF document text
    • http://mnogolidov.xyz/fonomaninojijajuxiva3sij0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fee1c8759e0d.pdfIn PDF document text
    • http://deemonatrafik.xyz/5879262456410mkm.pdfIn PDF document text
    • http://richteam.site/how_to_program_lg_remote_to_soundbarlkbfx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa3eabd36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_604469537d5db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68ab7643e5.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/cadccc68-57cf-4b88-861b-399ecd5d49a4/62110350926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29b27f9-56fd-4961-9dca-195ff1a30c91/how_to_write_a_rhetorical_analysis_essay_ap_lang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e352c2e9-16aa-414d-89a2-89aead8441dc/maytag_5000_series_dryer_door_reversal_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c9bf79-0bdf-42a1-8ef7-9fedee4e93f9/59196485159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f921255-1a2c-4760-921d-8243c9259808/gewisofebepazazojeteru.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_off0000c57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 5576 bytes
SHA-256: 9f96117af60dc883820e0cc0f57a9d7edaba5502ccc7fdae958fe63d9de59a14
font_01_sfnt_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10640 bytes
SHA-256: fe21620b441febf7240639b1d798a715635e3b9bbea20748ac6c650373d6950f

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