Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e72dfd10a1d83…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 08:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fed1e8c803dd144b35df30b6bded5eb4 SHA-1: f9f34581eca76600cdb9112b0a933e9cb075f86c SHA-256: bc1e72dfd10a1d83a1c5242b9581511b5652fb8110e322ba388197fab5a30b02
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://vilenefex.ru/wix?keyword=rush+episode+guide+season+3', are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

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://vilenefex.ru/wix?keyword=rush+episode+guide+season+3 PDF link annotation
    • http://pesisasije.22web.org/10876369549.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/71e55a31518605.pdfIn PDF document text
    • http://lizakoku.22web.org/vu_canvas_student_guide.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/4389199eaee8c96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_c6296f39598b4e5c9f263685fadbd950.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1ebcd4-7948-4b1b-8907-739abca5abbe/mediwinenoxo.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_fefa8cf99cb94978aac6ac397cea06dc.pdf?index=trueIn PDF document text
    • http://ravuxigud.epizy.com/gsheet_file_view.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/75723196300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449fac3b-9b02-44d0-b0fb-d9deb1bd93a6/easy_learn_korean_language_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83ca078-d045-4cec-884f-a577eae9aa0e/how_to_master_the_art_of_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b19952f-958c-43de-a389-3aa402aec562/it_will_be_great_meaning.pdfIn PDF document text
    • http://vorawaforase.epizy.com/font_al_fresco_bold_free.pdfIn PDF document text
    • http://sazerubewufuzuk.epizy.com/50917033484.pdfIn PDF document text
    • http://rigemileluzed.epizy.com/jabukevaxonupivodeni.pdfIn PDF document text
    • http://jovebaben.epizy.com/renoniropodek.pdfIn PDF document text
    • http://fibejebovef.epizy.com/certificate_of_occupancy_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/alto_saxophone_sheet_music_with_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4befabcc-431a-4b71-b6f4-0252dc13c83f/55312145350.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_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 5264 bytes
SHA-256: 1efeccc0c7a1d4c1d241ddb0a287cd2699c8460fb20df891a1821dd7e4f4aafe
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 11844 bytes
SHA-256: 7db7a2f928b357ca40ae4dc81fdf1253274ab0a2ebc8d0de99fc5c7d9326a155

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