Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279660573b05d7a…

MALICIOUS

PDF

78.0 KB Created: 2021-05-28 12:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 75d8c056a091eb1abc0ca55e19d4d640 SHA-1: 27851f6931d6563d54d5fa2a9113dee46f22404d SHA-256: 8279660573b05d7a1bd793fca61ef1362fe6aa5da783dd06bebdbf868aeb3c9d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://leonvi.ru/123?utm_term=capitalize+proper+nouns+worksheet+3rd+grade', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • 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://leonvi.ru/123?utm_term=capitalize+proper+nouns+worksheet+3rd+grade PDF link annotation
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/jagaxav_momip_ruwozafasewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60210d84b7344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_604ab9994254c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601024bc0a675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6067b97e24921.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/ramizef_zepidazewafekow_lafafabakenama.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/xasotegilifasesede.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/aa849e.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/8e0eb243-fcc3-4287-83db-55ad4c215420/nipefemebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5f8ce9-6215-4704-b0e8-f895c4b563eb/fundamentals_of_project_management_course_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996c3ec1-1f4b-4642-9d2a-8a4a148bebf7/how_to_use_ifb_convection_microwave_for_baking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2976ab15-1f8e-47f7-b1f7-2e6a5f454782/sujigilowovipurejijimimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c3ab8e-58da-47a3-8b7d-8db9024d7b7c/37448775237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712ff9e8-8035-48ca-a766-84227efe3ed6/how_to_complete_an_incomplete_f_table_0.05.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb79918-6a61-4c8e-9cfc-423820f1ca1e/what_color_is_red_and_yellow_mixed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d53758-f9cf-4d27-b251-bbcd28bfd550/5e_campaign_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38adb89b-a91f-4cc4-8e84-dbf0c5d8d6e3/9458410860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61dd7a-89e1-4f71-83b6-113ee57c8f37/83798284603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e07732-db1f-4606-be2d-46dfca255a67/jowupemidimofovewenimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5b7bc7-0bbf-4618-a9d2-0f44abe35aba/35852116752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ebacd35-a0f3-4efa-922a-150b22d16ff2/dowirogaputu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0832e9e-862f-4d3f-a3e0-87703e4417ea/68030820717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf9ab8b-2cd1-4392-a959-0be214b9524a/23498803589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f21239-32b4-4b08-a336-8b93e159ada7/how_often_do_you_change_transmission_fluid_in_jeep_grand_cherokee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5244fe10-1c0b-45bf-873e-61f3c65cd485/57690201178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edc7ca1-ef64-4e14-a774-289396f42bbb/how_much_is_mark_harmon_worth.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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5496 bytes
SHA-256: 23c9da480cbb23b2f10249ad9bbe1dfcacc058588452034d619852d802e96a84
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 10776 bytes
SHA-256: 1ffd9efd6b75a7b16f69a0fe21cbbfbdb6579ec54511e23f5a2266ba8fdbb447

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