Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b630f025413d4a…

MALICIOUS

PDF

72.1 KB Created: 2021-04-30 14:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce8f6861949dd277039503941042124d SHA-1: 7800df1da99912234e5bfe518d3f00a63874ceed SHA-256: a3b630f025413d4a55d80990353fcac6850886f071fd84a4f083f5e1f5ecce56
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+to+say+it%2527s+okay+in+spanish PDF link annotation
    • http://biomaniks.website/singing_for_the_stars_bookf7mq4.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/hhifVxd/1950742679.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/825e0c2cc8.pdfIn PDF document text
    • http://storeeu.info/2006_ford_f250_super_duty_oil_change89prv.pdfIn PDF document text
    • http://cg-designer.xyz/3391136033e3q96.pdfIn PDF document text
    • http://matteset-spon.space/nikon_dx_55-200mm_camera63dzs.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/daxawavitiluvan-vusedapit.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/xjixS5X/5954343632.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/kanokewufakora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/symbol_scanner_setup_stb4278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80496a74-fe85-40e5-858b-0978531dce8a/56923427647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a00eddd-3d5f-4921-8550-5a55a11fdd4b/agatha_christies_poirot_season_10_episode_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5576500e-295b-4eb7-a7a9-87b523705b04/work_power_and_energy_multiple_choice_questions_with_answers_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b42f1c-1033-4c9b-9c46-31b3e794f2d8/ernie_ball_vp_jr_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017a193f-ecd8-454a-89a8-b80666b84182/stoeger_m3500_benelli_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917cba2f-6b2d-4149-98da-8ab564992424/casio_g_shock_3031_battery_replacement.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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 5032 bytes
SHA-256: 05cc23bad5213d15a39be0c42e338eb186cb2138af498e68f027aa113fe4ecfb
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 11228 bytes
SHA-256: 827f0d31165ce6990ed73f74e8a6b7eb816755b1316dab5a0aee19cee5cce80e

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