Malicious PDF — malware analysis report

Static analysis result for SHA-256 805fc538fb226f7d…

MALICIOUS

PDF

154.1 KB Created: 2020-12-19 02:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fd6d07174dd4380c4c0c47caf1b1b887 SHA-1: 9bd36187fa09018d3d9af453cca83c8d1e237d1c SHA-256: 805fc538fb226f7db28471b980470e789491582affd046cee8d32d8d4aa884a4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/aws?utm_term=analogical+reasoning+report+meaning'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/aws?utm_term=analogical+reasoning+report+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5f99270627a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5fa38e078576d.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/taxakovimajobogovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f8f2219daae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fadc1d6ca3be.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/4050188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fb29a1c1c9e7.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/798fbbac6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fa9362ee6279.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/4ab8debf155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fa256fc7f7fd.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://uploads.strikinglycdn.com/files/dbbbd4e4-8f92-4049-9ebf-478d75db7ae3/poxiruz.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/apple_email_file_format.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/insert_a_manual_line_break_word.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD36 5032 bytes
SHA-256: 793f552bd729f70ccac48586f840a6e13aed3931ffb99240862a18c5b211f2be
font_01_sfnt_off00020e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E2E 11976 bytes
SHA-256: 676f98317f04a72b397b3f307a5590123d52f6f4aeb38ae3af80c7968696974a
font_02_sfnt_off0002364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2364E 16316 bytes
SHA-256: ff7743007aa28162a3ee9cd8a1dc8b7f8fce36e4a7978775bfdedf44e9073a90
font_03_sfnt_off00024c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C39 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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