Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a1507dab0686a5…

MALICIOUS

PDF

76.5 KB Created: 2021-01-02 11:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f59aca343c298b609466b34d4a69580 SHA-1: ea8d4386a18c48b14fde9d4f954ef4ae9cd9cd3d SHA-256: 29a1507dab0686a515d113f2bb9493d99889b343761475db243b94b09c7231fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=stony+brook+family+medicine+residency'. This indicates the document's primary purpose is to lure users to a potentially harmful external site. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=stony+brook+family+medicine+residency In 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://uploads.strikinglycdn.com/files/7118d765-b1dc-4c43-a99d-4a326deceb6f/90276163787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef265ae-5bb4-439d-b01f-7edd89520a16/66450835802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7aaab8-42c3-44ac-8a71-3516b7db4982/fawawenigu.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/62550724075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34398e44-ea05-4009-b482-eda8824ce770/sifugo.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/fogerolumaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e450213-b93c-405d-93b3-bd732e8748ca/vexosumupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a0f080-c23a-4c15-8fcd-c74ef908569b/manadomarifolaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea60206-ca72-4d1f-ab40-7441757601d8/lexmark_730_series_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/caa_membership_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/nosoju.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/frieslandcampina_annual_report_2019.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 5364 bytes
SHA-256: ac93fd119cf3fd47a08ae3eb4a91de4032f75343cbad360dbffdb99b04adf02f
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 11220 bytes
SHA-256: c69332da94923f3e2cae503cb871c88097f1fddcf0ec150dd02cf2d4c85ae83a
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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