Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fbae40b64afedd…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 22:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4debfb5230eaf227ce3244eb89e369cd SHA-1: f2e167c4fabf6eb8fcd840d2b927a9ecc2121b31 SHA-256: 75fbae40b64afedd5f670d640a25af82923cfbbedb979839f910e1b897728db3
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a malicious payload. The document body, though heavily obfuscated, appears to be a lure related to 'home recording for musicians'. No scripts were extracted, but the PDF structure itself facilitated the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dafemum.ru/aws?utm_term=home+recording+for+musicians+for+dummies+pdf
    • http://wugipesirexoxof.mygamesonline.org/94033045554.pdf
    • http://ninozefumuwu.iblogger.org/81750988344.pdf
    • http://bisibometixo.mywebcommunity.org/72887945951.pdf
    • https://cdn.sqhk.co/vedafigula/lQ06SS0/zambia_report_breaking_news.pdf
    • http://wemirepijamo.iblogger.org/kogibu.pdf
    • https://cdn.sqhk.co/ximirujusuxo/hhicghT/pesatesez.pdf
    • https://cdn.sqhk.co/murafabu/ijoighd/xamimevujonedaluxivonemol.pdf
    • https://cdn.sqhk.co/lituxopevuk/idjaheD/45569056188.pdf
    • https://cdn.sqhk.co/jutalufelex/giTt3jh/wepakumodamakigidugikog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c0fffe62-8b3a-4056-afe7-46d71dfca715/how_to_reset_a_westinghouse_oven.pdf
    • https://uploads.strikinglycdn.com/files/efee78fc-32d5-488c-a433-b84f71716132/71028912909.pdf
    • https://uploads.strikinglycdn.com/files/8745a8a8-c8e8-4c4f-94e6-2338f9a0da95/zivetat.pdf
    • https://uploads.strikinglycdn.com/files/2cb3d0e9-79bd-4158-9916-d176c1eab0b7/87236903741.pdf
    • https://uploads.strikinglycdn.com/files/530c9d6e-ae19-4020-8175-34ce488b3dac/dugovejamexisefo.pdf
    • http://gopivikanofo.rf.gd/25312769050.pdf
    • https://uploads.strikinglycdn.com/files/79e20931-8400-4222-81d5-c2e968c0c61e/mirorinavoxotomabobitevi.pdf
    • https://uploads.strikinglycdn.com/files/e5150de5-e4b8-494a-8847-6f412d1b6a9c/lg_lre3083st_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/3d5c2874-35f5-45e1-a2d6-36d06bcf89f5/what_to_eat_for_flat_tummy_after_c_section.pdf
    • https://uploads.strikinglycdn.com/files/f1c360cd-104b-4bf6-98ad-d69705ad68f9/great_lakes_data_science_and_business_analytics_course.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_off0000f08b.bin
29cc3610ca9ec464f9531219156b1c6e75a4e77bd42bba03801f3cc4aa6bd1a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5404 bytes
font_01_sfnt_off000102da.bin
c2499404a3053ebc487675cf42b46df8b9a65d33887eadf1a58966a4c1e22037
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11376 bytes