Malicious PDF — malware analysis report

Static analysis result for SHA-256 767f9d3a5a59366c…

MALICIOUS

PDF

79.6 KB Created: 2021-06-02 12:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0f956be725e22d5990f07e539cb85121 SHA-1: 8a29a162e1ece11e84070234995c69f43ea053f6 SHA-256: 767f9d3a5a59366c2311ff798dd3a0ef7cdca456aaa4121944925ea80e237992
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, with a primary suspicious URL pointing to 'medvor.ru', suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further support a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=dell+usb+3.0+to+ethernet+adapter+driver+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479705/normal_6005f29074df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_5fd97e211cc0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_60505756f0d93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_5ff3940e8235b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_606c5b1dbe8d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_602528c227559.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478127/normal_60b3fb3155943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fc7420a4a4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_6039f88d1b71d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_601f219cc9ed2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fd0349a27531.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4500677/normal_60b41a4e3dec9.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://lekipirunezi.pbworks.com/w/file/fetch/144416730/buxumarapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd27563-063d-45fb-8d0c-35bc5bb2a8d3/40712510771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42a8bde-fd9b-4db6-8fd5-5d3a680d8120/lekirelegakokisukevu.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144483795/doruzunevobegubun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774ace70-e65d-4672-aba0-9600530279f1/7796560422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c25b7f-3d5d-4be7-a62b-fbfd8497dbc2/jomabuxunexikidetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e31a94f-96ff-418a-ae04-9dbbf9b9b543/brinkmann_grill_model_810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18a59d0-7db5-4e44-882a-4fe51787656d/pretty_little_liars_season_5_episode_25_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ab0880-63b5-40b3-9d56-44a5242bbc45/60973367382.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144470895/how_to_pass_transcribeme_audio_exam_2021.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144418098/car_interior_3d_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833f70b4-3c44-4680-93a4-1ea77405b8a4/97979465845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69939a37-a8c9-461c-98ef-fc6f5fe592c5/which_way_does_my_air_filter_go_in_my_furnace.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5608 bytes
SHA-256: b97e8e814919391ab7c74e3110c19ca30167b514371e03409ba21fb39773f32c
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10452 bytes
SHA-256: 5620ee13666ec63b339b83fef9cb98c6ea3a4f78ea50be35b43ef3cbedfab92f
font_02_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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