Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf166803fa568b9…

MALICIOUS

PDF

70.0 KB Created: 2020-11-12 21:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 76eefd3646248947cd18f0c301f293dd SHA-1: 93088596490b86f24f78e593dde72eb0cc31e131 SHA-256: bcf166803fa568b91fd5c96eae866d511cc7049f22112ce84fed10225f5638dc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to harmful sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=left+outer+join+crystal+reports+not+working In PDF document text
    • https://tigisara.weebly.com/uploads/1/3/4/6/134651617/b7ad1a.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/691250f5ff7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_5f9f341903741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/5988084832.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/4th_grade_common_and_proper_noun_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/tadoxibafimorovomuwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e58c4d6-ac8d-4e20-bd4f-c8cd226cc6bc/92620760149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7525c1-8d09-419c-8162-f5a522bd0c02/66328337679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a4325a-3c8c-45c1-b7c3-848b238c471d/99101857191.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/taxonomy_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/expresate_2_textbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4d6375-b721-4bbb-81e6-aa428eb25b1c/duwasulisapowibalebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686f5eb9-4ed1-4a8a-855d-9d7e82e56352/agco_tractor_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a867491-babf-48af-bb52-c2541ed2e4f1/jixiwasidadaliji.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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 5460 bytes
SHA-256: 2cc0fac2a5ecc7f66ce1a067e81c0f85bca1c15f2cc18b455da51198f401704b
font_01_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 13696 bytes
SHA-256: b7bc9f9d9bc315467ecd5457512e7ab3fee21b5313d2d6b0771f969212260c01

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