Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ffd05efa97d124…

MALICIOUS

PDF

71.8 KB Created: 2021-02-23 13:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e210821c7adb4ae66b505b81d02a3c1 SHA-1: 36a0fcee2df582863f164b5fa257121eaaff8ab2 SHA-256: f1ffd05efa97d1243b25258dd1b4ca8e2d27457b9b85d6f832d0cf4e754d3cbd
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/aws?utm_term=math+worksheets+for+1st+grader In PDF document text
    • https://wokusozevopiwaj.weebly.com/uploads/1/3/4/3/134381386/runek-sufaveleri-soxetikep.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/7935029.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/yhdUheb/25040761896.pdfIn PDF document text
    • http://degujub.iblogger.org/all_tamil_dubbed_movies_in_tamilrockers.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/pirofopafu/flat_stanley_response_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/6761146038.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/libert_paul_eluard_analyse_histoire_des_arts.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/how_much_is_the_xbox_one_on_black_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/pilujiw.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/risk_assessment_matrix_template.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 5352 bytes
SHA-256: 04982e9236adfc0211baca4b13897eb37a7f7cf4841f06bb315dbde4e7f725ec
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11312 bytes
SHA-256: dc805f1e5abb51f7e11664ed8dd972f642d8f0736cc25a6aed737138cb56cc28

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