Malicious PDF — malware analysis report

Static analysis result for SHA-256 68595d16037046c2…

MALICIOUS

PDF

96.9 KB Created: 2021-04-18 14:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b90410a477aeed767328c789c1838057 SHA-1: 230cfc0c97b20e3085690c6db38f814a6b9d8bc6 SHA-256: 68595d16037046c228a36f3f8fb8213c2ba6e50b6c9a80d95db25c3bbed2b34b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://jumiwimov.ru/strik?utm_term=metal+gear+acid+2+walkthrough PDF link annotation
    • http://look-hotel.com/201935524y7gdj.pdfIn PDF document text
    • http://bet-info.ru/jafoxemasafafjpyl6.pdfIn PDF document text
    • http://mosquito.codes/sopoxodotojisetidovubenul8r.pdfIn PDF document text
    • http://moymagazin.xyz/todos_los_libros_de_juego_de_tronos_en_ordenevos1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466666/normal_5fecb9f973a4a.pdfIn PDF document text
    • http://konolux.medianewsonline.com/numeros_romanos_1_al_500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_60119b30c4e1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5fe40b3b7390c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fe5032a4d44a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pulutugorivexek.atwebpages.com/17145900083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07610a7e-5503-4382-8760-0b29e06646f1/stained_glass_window_linear_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3360c452-6118-4070-8f2c-9d2f4d229108/how_to_calculate_electric_heater_size_for_a_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b752d39-88c7-4991-a0f2-6959908ae1e7/carry_on_wayward_son_neoni_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aec028f-4b56-41ce-bf29-e18c9f012170/84201150632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c378ce-e677-4d43-a5d4-994674c390f3/why_does_my_pressure_washer_keep_losing_pressure.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_57534e2fd07f4ab08fe909ef2c9118fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bad8eae-0be4-4b3a-b485-62d1036fdfa8/samsung_galaxy_s5_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1984468-fd7f-43f6-b605-a2ca375c9bb9/pozotadejozavobudofuv.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_5bac750f2d1848828b34fde5d9822797.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 5092 bytes
SHA-256: 20083cedc32456ef21376b1580f195a0d903819bf02b5f9ec19b830c3fa6e500
font_01_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 12416 bytes
SHA-256: 8e475aef98e8f3ec5be4989a9aec4d4e90907609b9a2559577754b000deb9c47
font_02_sfnt_off000167fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34