Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab069947934e02d6…

MALICIOUS

PDF

92.5 KB Created: 2021-05-28 20:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6c66f8bfda3c8104a5447b344a64888 SHA-1: db94c73ed6fc9991a1a5d14cb65bd4044dfcf674 SHA-256: ab069947934e02d68f9d0eaab5771920758f993a3b389d383316836ae02c6b9a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic resources, indicating a link farm or phishing attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/123?utm_term=cxc+maths+past+papers+2016+answers
    • https://cdn-cms.f-static.net/uploads/4496402/normal_6025ddbe379ca.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fe8c82457337.pdf
    • https://buzalunila.weebly.com/uploads/1/3/1/6/131606025/1115881.pdf
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5fd7dd88d5aa6.pdf
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5fff2a3c2e7ae.pdf
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/8b2de3b6.pdf
    • https://cdn-cms.f-static.net/uploads/4388426/normal_6047ca7c8f134.pdf
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fdba8445e11e.pdf
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff0983da551b.pdf
    • https://static.s123-cdn-static.com/uploads/4471481/normal_5ff904fef3fa0.pdf
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5fe27604e91fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/29723520-433e-469a-acb6-715799cabe5a/free_digital_marketing_courses_dublin.pdf
    • https://uploads.strikinglycdn.com/files/ed0aa1ba-11b1-4069-8599-833fd02a2e5d/6388008077.pdf
    • https://uploads.strikinglycdn.com/files/2801056d-3a0d-419a-b446-f0a2a5c23c71/shark_navigator_pet_pro_vacuum_reviews.pdf
    • https://uploads.strikinglycdn.com/files/c4b2b7df-a671-4348-b083-f92614578d0a/xevaxibowadum.pdf
    • https://uploads.strikinglycdn.com/files/cde72bbb-2541-45d9-8d3c-fa7c1f2e6e87/pejiwemawidutumogeb.pdf
    • https://uploads.strikinglycdn.com/files/9dee036b-b919-43f5-b8ac-1f0ecb7902a2/matlab_plot_markers_colors.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011841.bin
8363c3144fad7baa4896b0c2a26cff91260c7879249a98447851bec5a005d19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 5688 bytes
font_01_sfnt_off00012b7a.bin
149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 6148 bytes
font_02_sfnt_off00013b59.bin
54e29730197535096f07edf4643423eff06b49f92ca8644daffeed98d373a490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B59 12012 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.