Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd26734182e89dc7…

MALICIOUS

PDF

164.4 KB Created: 2021-04-01 08:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff7da21f117d5d92a4aed0d417b8783 SHA-1: 220b88a43526c07428589068f9745ed16a981f0c SHA-256: dd26734182e89dc7222bd34b3b1bf8b8d9b62fcaf9d46d0aa01a8da23898dbf6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were extracted, the presence of external URIs and the overall detection suggest the document is designed to exploit the user through social engineering tactics, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/wix?keyword=spy+2015+google+docs
    • https://cdn.sqhk.co/widafopaj/cF8jd2k/trials_frontier_data_cube_drop_zone.pdf
    • https://cdn.sqhk.co/musamari/WEhagjQ/cute_drawings_of_animals_and_food.pdf
    • http://jepenufi.getenjoyment.net/matlab_function_return_array.pdf
    • https://cdn-cms.f-static.net/uploads/4381971/normal_601391b76ff97.pdf
    • https://cdn.sqhk.co/divoxisig/yohdqmt/matrixyl_synthe_6_benefits.pdf
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5fccb13d3758c.pdf
    • https://static.s123-cdn-static.com/uploads/4478947/normal_5fc612b124119.pdf
    • https://cdn.sqhk.co/lopijikuvi/hjVighj/sutelamonikuxu.pdf
    • https://cdn.sqhk.co/koroxofusino/2Q8gcD3/hockey_jersey_over_hoodie.pdf
    • https://cdn.sqhk.co/xupumekejaxa/d6VfdHe/23050774467.pdf
    • https://cdn-cms.f-static.net/uploads/4492586/normal_6036cc2709db3.pdf
    • https://cdn.sqhk.co/moturalogupe/ggy58ie/robotics_companies_in_colorado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zemofebu.epizy.com/management_summary_template_ppt.pdf
    • https://uploads.strikinglycdn.com/files/2d4d6874-7221-46f4-a11c-367008f22e70/66601271940.pdf
    • https://uploads.strikinglycdn.com/files/fa1ed504-00e4-43c9-805e-cd8512c7c4bb/96880701729.pdf
    • http://sidukumu.epizy.com/bovupijezizazi.pdf
    • http://gomugugagaf.onlinewebshop.net/80013191475.pdf
    • https://uploads.strikinglycdn.com/files/011fb379-1ef6-4eaf-8ea7-6890f2a342c8/11291602391.pdf
    • http://nozozuwovore.atwebpages.com/future_of_artificial_intelligence_in_banking.pdf
    • http://kevatudoritek.rf.gd/lulapiximanaxom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002193c.bin
848ecdc74ff08e0b7d9fe787c375c32925fd6e76d87316ffcd2e89cffe197fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2193C 13668 bytes
font_01_sfnt_off00024548.bin
e95f89c84b9749cd9de8306b540c6f774dffcb4de92314e1851ba9c3bbf9dfad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24548 5588 bytes
font_02_sfnt_off00025884.bin
80292053f17a1052da83547c50434b7ebb53913675f7260b50ee5e22ddd7db57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25884 13076 bytes

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