Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b412fdbef7d5dcd…

MALICIOUS

PDF

83.0 KB Created: 2021-03-30 19:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45ac4ba581bce46b48e65b5a665103b3 SHA-1: 769fc9eebe34bf9c2b4c9f61961ed811ac90b425 SHA-256: 2b412fdbef7d5dcdffd3bb685a97941c9b85792ab6519ac83d46b0bf56b84628
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=ap+lit+prose+essay+thesis+examples
    • https://cdn.sqhk.co/lupobikud/YLiahgf/vuxenitalifasen.pdf
    • http://balonixom.22web.org/why_is_it_important_to_follow_teachers_instructions.pdf
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/27ea184b137e.pdf
    • https://cdn.sqhk.co/vetedaxuzele/Dbjc3hi/78672443623.pdf
    • https://cdn.sqhk.co/jegamaxegev/jeLJhah/20951803937.pdf
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/34fdac.pdf
    • https://cdn.sqhk.co/lovojekaboxi/eAIfhhg/what_time_does_joplin_mall_open.pdf
    • https://cdn.sqhk.co/talokelom/HClhaih/12383006398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c6ee2830686f484fa43acdf753b3a897.pdf?index=true
    • http://pasufok.rf.gd/how_do_you_use_a_aroma_rice_cooker.pdf
    • https://uploads.strikinglycdn.com/files/19f44105-e90a-435f-a7f7-3a36c24301fd/age_of_heroes_hesiod.pdf
    • http://vavoxixe.epizy.com/nukulosifupoledulo.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2346a93e57ae4e8ebf3a7f57be65db66.pdf?index=true
    • http://kitomov.epizy.com/kmspico_windows_10_enterprise.pdf
    • http://rimivumukox.epizy.com/pexibadisivuxenawaw.pdf
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_92a43a4c990247859cd9fdaef2ec02a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/011ca008-b2eb-41be-9c9b-e9e8f417b849/3240807857.pdf
    • https://uploads.strikinglycdn.com/files/c2293005-018e-4b2b-818d-20c79bae9c69/2636588820.pdf
    • https://uploads.strikinglycdn.com/files/3e09b9b2-15f7-4140-9ff4-58ff25e072bb/90896674942.pdf
    • http://lifised.epizy.com/aprilaire_model_8365_programmable_thermostat_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a5.bin
a02427a0760829e0c4358f701eb134a9e3b7dae3c0b6951946505c17cf0365e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 5216 bytes
font_01_sfnt_off00011844.bin
59c4b11719769efd31dfd27c55edbb158ff78a7a42faeda419f162013cb507bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 11384 bytes

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