Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98bf4cdf485877c…

MALICIOUS

PDF

69.1 KB Created: 2021-03-24 18:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39c5acbb53b4cfe53e5e5f42d1c84357 SHA-1: d7d7fa5421e1f4aedaf6be25f3e1ebdf17b3ad80 SHA-256: f98bf4cdf485877cd677d4fe3b92094cb079380072d2243e1a58fa3b676d2674
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a malicious payload or phish for credentials. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/123?utm_term=adaptive+icon+pack+android
    • http://vurejowug.mypressonline.com/the_chrysalids_chapter_9_and_10_summary.pdf
    • http://saxobupazes.sportsontheweb.net/tesifipijosen.pdf
    • http://avtovishki-msk.ru/subject_verb_agreement_quiz_with_answers_docfer0x.pdf
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6021544e8981b.pdf
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fde12cc4e44a.pdf
    • https://cdn-cms.f-static.net/uploads/4490722/normal_603955aae8b09.pdf
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fd177b7e59c9.pdf
    • http://store50off.info/myles_munroe_childrenifio8.pdf
    • http://dapunajav.22web.org/game_dev_tycoon_apk_1._4._7.pdf
    • http://italywom.space/gandhian_philosophy_of_wealth_managementy3q6d.pdf
    • http://bigwin-1xbet.fun/47981096895tngqd.pdf
    • https://static.s123-cdn-static.com/uploads/4422144/normal_6003bf7dc0e35.pdf
    • http://copyright-infringement.business/kazadokim1xqz3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7018f109-3719-43eb-acea-c30cc2b5ce9f/53966681550.pdf
    • http://tibamupebunod.atwebpages.com/business_systems_analyst_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/60d4db56-2c14-4870-89a2-aefbbc9a2bc7/developing_management_skills_9th_edition_publish_date.pdf
    • https://uploads.strikinglycdn.com/files/1ed731b5-0f9a-4252-b97a-d80484d7bbb7/fifapesufanog.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_23412b75ceae4ef3bb2dbafdfd9ae3ce.pdf?index=true
    • http://warevaxuderisi.rf.gd/printable_subtraction_borrowing_worksheets.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_1f80ccbf149e422d90b3ce3d14e5df1a.pdf?index=true
    • http://jizipok.rf.gd/48680944982.pdf
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_c8d35db6a650436aa03018b890c17352.pdf?index=true
    • http://tonataf.epizy.com/vizio_32_inch_tv_no_remote.pdf
    • https://uploads.strikinglycdn.com/files/7467ae69-54f7-4bb3-ae5e-1b5e367d6040/bose_companion_3_series_ii_repair_manual.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_off0000d3cf.bin
c3969d7cccd0e8447a3d12dd572afda646f8f35d32fc5cbd747e19b4f211cb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 4968 bytes
font_01_sfnt_off0000e4cd.bin
054f4971d56496b71c6b38f19b5f6fbf07fb8a52e701b8f212046212fe41f518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10380 bytes

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