Malicious PDF — malware analysis report

Static analysis result for SHA-256 25895ef20ac3292d…

MALICIOUS

PDF

83.0 KB Created: 2021-05-23 10:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e1e028bc3599602aaba8fb429aa0b552 SHA-1: 215af96bbc0312e46d21beb13a86d65331d4d81d SHA-256: 25895ef20ac3292d91025639484d396ed28a0302cc110d9ee4384bb419722c8a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF file flagged by multiple heuristics as malicious, including brand impersonation for credential phishing and a link farm. The ML classifier output of 0.999 strongly indicates malicious intent. The primary lure appears to be an impersonation of Outlook, directing users to a redirector URL which likely leads to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/basiduv-xexatotudezevun.pdf.
  • 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://botokaw.ru/strik?utm_term=mba+in+operations+management+salary PDF link annotation
    • https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/basiduv-xexatotudezevun.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/c6138d598.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/denivesowivop.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/916972.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/dopamigikogad_dufapobivejex.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/6742786.pdfIn PDF document text
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/7913840.pdfIn PDF document text
    • https://fosevagepuvuro.weebly.com/uploads/1/3/1/8/131858592/favimutugesiwolebe.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
    • https://s3.amazonaws.com/fajixe/60904336144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff68e6c-e58a-461d-ab6f-9196a90d3158/shop_interior_design_software_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145bffd4-8d5c-4bea-b3ab-723a60dfd849/bojogezuzemirebel.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/65435399669.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/malayalam_cinema_box_office_collection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/reinforced_concrete_design_to_eurocode_2_seventh_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/capacity_building_programme_for_teachers_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065075ab-822a-4960-a39b-ae6a75001c51/42462396909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356a8d11-9f68-45d4-8ab9-afc09103002b/36395376521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a5f7b2-cfc9-4c18-875a-46ccca023b59/2769750781.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/90451845731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c7fcf6-1847-4b44-af71-79a938fbaec0/xomiminiremavik.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/adverbs_worksheet_for_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd1b56d-fd45-4ba6-bcd2-b6cb6f507034/how_to_get_rid_of_acne_scars_and_stretch_marks.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/apkmirror_chrome_apk.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_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 5172 bytes
SHA-256: b7507066965d3818fa9b81d037ea4cd6958fd3e29713d2241bb2da61124d0ab0
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 11116 bytes
SHA-256: c13c2ec9b1e08b5274f6c1d67398d0150b66465773419468c57bf25b8f2b3d61
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34