Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eb6eb4f29e2936…

MALICIOUS

PDF

69.8 KB Created: 2020-11-10 07:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5b060f2a1ff8ad94007135d6d0734aa9 SHA-1: d63e22d058cc1b2f991d2de282d3896a73dc105a SHA-256: 81eb6eb4f29e293698e2aad069c326081366e182c0a6000502e36026fcd548fc
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ggtraff.ru, which is disguised as a search result for a textbook. This indicates a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=financial+accounting+8th+edition+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc850ca-6e82-4247-88d0-43f717e3143c/27354164457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167a5c3c-cbc8-4511-ab5e-c88ffd1d4ea5/tails_nightmare_3_demo_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0ae655-61af-439d-9f99-ec492df484c5/jebibasebelazumuroxoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ca523f-07eb-47fd-a083-89b186ca2d44/trik_bisa_download_web_bangbross_full_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce99de6-9632-445c-be36-72217f0d2c70/78075074959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e75694-1338-4735-b45f-7c0002ffe906/graphing_linear_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/mamogekupigoxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97f0c36-5e2b-411a-9940-5f1f65db6dac/gonugodakase.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/63952294126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd0e469-7504-421c-a69e-5a29e75f0660/watch_zero_dark_thirty_online_free_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c9782b-0c9a-49df-bcb4-73d264f7be39/julius_robert_bay_tapert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0a606-2f14-4546-afef-d90a229ae49c/transylvania_6_5000_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383c654b-fc80-461f-b4cd-ac188da3fe63/kesap.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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 5292 bytes
SHA-256: f14acffde72e29f0625734ea1740395c4c3ea5a45db463fbccc88af3fe1daf32
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 12620 bytes
SHA-256: cfaecefcd0b8f64c5ec96d60a7fcbf6a65c281b72343331723e20c9dd88efef3

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