Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b380175130da60b…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 02:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb603a27fba2c563c1ec2fadb30e4fbd SHA-1: 9e0e7c4000b4ceaeb58cabc716595f7adafb6edf SHA-256: 1b380175130da60bc311bea9d35e6620e4e75187eeebc0f628baee66de191855
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'special right triangles worksheet answer key', aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gimoguvi.ru/wix?keyword=special+right+triangles+worksheet+answer+key
    • http://pigirajeku.22web.org/kojovupesonikad.pdf
    • http://zuzavofe.iblogger.org/network_administrator_interview_questions_and_answers_free_download.pdf
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/8779361.pdf
    • https://cdn.sqhk.co/kugefiruxat/cdjdjcQ/gts_companion_ios.pdf
    • https://tidixusega.weebly.com/uploads/1/3/1/3/131380021/5966855.pdf
    • https://cdn.sqhk.co/rirexiwudag/e00hagd/drivetime_reviews_yelp.pdf
    • https://cdn.sqhk.co/puxezuxivas/hnAlDTv/weed_killer_safe_for_grass.pdf
    • https://bosofivi.weebly.com/uploads/1/3/4/6/134668799/bowitek_nuveben.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovedukevikov/dunkin_donuts_calories_caramel_swirl_iced_coffee.pdf
    • https://uploads.strikinglycdn.com/files/b381d5cd-0348-480c-853b-ce3d8d49162f/how_much_does_a_bryant_ac_unit_cost.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_c6f353fc6f2c4c0ebc34c34b52bbba1b.pdf?index=true
    • https://s3.amazonaws.com/fezenur/how_to_get_rid_of_dark_hollow_eyes.pdf
    • https://uploads.strikinglycdn.com/files/9479986a-f61d-4395-97fa-870d632d70ca/ridevemapogow.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0219682818164be39954e05449e21865.pdf?index=true
    • http://kikumofesokir.rf.gd/investment_appraisal_methods.pdf
    • https://uploads.strikinglycdn.com/files/c68f44e0-5ebf-48a5-868a-e7f22e7bf98f/vuvividilonulepetukubonu.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_off0000eb3c.bin
b7e9839f1ef51827df40d74c7c5c46cd1c7a4e8535ba5dfb91432e6ae4a35d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 5556 bytes
font_01_sfnt_off0000fe30.bin
683b4e200867e189f15c194ec37138904522b6c0805ed7e8befca5be547c7295
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10432 bytes