Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6135b8d5103f39…

MALICIOUS

PDF

67.0 KB Created: 2020-11-10 07:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6d0d72422589894397dfa4ef212992 SHA-1: 99cb4ee601dba70d33e61656fd84d49386b2ac2b SHA-256: dc6135b8d5103f39fb82cf3532b6914cafeecdc0ecb6690487bc047e827d43b9
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 a URL that appears to be a lure for software downloads. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The embedded URL is likely intended to redirect the user to a malicious site to download malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?keyword=photo+studio+pro+apk+download
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5f9af7742c5d0.pdf
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5f9dd75a4a9dc.pdf
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f88887d1c240.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/5c8067d7.pdf
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f899f76a2e1c.pdf
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/e326b68f3fa11e.pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fa334168ecae.pdf
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/8854657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfedf305-148e-4b85-a74e-a1167283fa2f/wemoluritirir.pdf
    • https://uploads.strikinglycdn.com/files/e43388df-099a-4e72-8a69-682f89eadd6f/kilegibuwazadusud.pdf
    • https://uploads.strikinglycdn.com/files/11934393-f0ab-4171-b59a-76c0f4efad7d/hwarang_ep_12_eng_sub_kissasian.pdf
    • https://s3.amazonaws.com/fulazelof/6395104425.pdf
    • https://uploads.strikinglycdn.com/files/264874a0-823f-4012-8a12-e430a10eebb5/minecraft_mirrors_edge_map.pdf
    • https://uploads.strikinglycdn.com/files/c8415bd0-d7cf-4b35-92b0-4e475f21c214/calculate_tax_return_for_2020.pdf
    • https://uploads.strikinglycdn.com/files/a844a7f5-0bb7-44c9-bb86-1d5872c447ea/12227800597.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94d.bin
d1b97503e47d7e8ddf15b4e5d0820639952b81d603edf98a9e72ee09510eb018
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 5204 bytes
font_01_sfnt_off0000db07.bin
890b1aa1c0aa363a5b0edb3206c5d74c23246f965d01313848d25a27a9546559
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 10928 bytes