Malicious PDF — malware analysis report

Static analysis result for SHA-256 4573a5e812fbea2d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 14:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d1234c96388ef1bcb7a7975ab704927 SHA-1: d634caa9e82f88591912a6127dbeab51921da17c SHA-256: 4573a5e812fbea2da35489496eca30fd045ad5b4094fbf47c93f989841207571
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, which is likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, suggests a lure related to 'cladogram practice problems and answers' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=cladogram+practice+problems+and+answers
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68c1d9eaa1.pdf
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60186841116fc.pdf
    • https://cdn-cms.f-static.net/uploads/4490251/normal_601f1d81c2199.pdf
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fe136321a364.pdf
    • http://farvestnn.ru/sefonekegi0arxa.pdf
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fca967ca1b97.pdf
    • http://prequester.online/lowojikob2l8s3.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_60399d4a5a0a6.pdf
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2f9c9de5de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wizitifowubux/derulawikagulosobik.pdf
    • https://uploads.strikinglycdn.com/files/8306c449-8bd2-4d22-8d49-759b7b8abb10/wapolaxopateben.pdf
    • https://uploads.strikinglycdn.com/files/a4b6dbda-6388-47b3-bb2b-3ff01a6cbff2/taking_sides_clashing_views_in_world_politics_18th_edition.pdf
    • http://fetafuxukijixex.rf.gd/tipijesosapom.pdf
    • https://uploads.strikinglycdn.com/files/190601ac-61fe-44df-8bb8-6f7dbd1979da/2455743679.pdf
    • https://s3.amazonaws.com/palikuvexake/java_11_jre.pdf
    • http://romuwoturifitam.epizy.com/bepirokamilejebixogib.pdf
    • https://uploads.strikinglycdn.com/files/097555f5-911e-4123-82aa-2e8d48f37f02/xudifinavubanavazoravi.pdf
    • http://wovovaj.rf.gd/87372526020.pdf
    • https://s3.amazonaws.com/rujabepifar/past_progressive_tense_worksheets_for_grade_5.pdf
    • https://s3.amazonaws.com/ginutu/power_cooker_6_quart_digital_pressure_cooker_recipes.pdf
    • https://s3.amazonaws.com/fejenijovekozu/vizuwidodemufuwej.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_off0000de94.bin
24e585983e87fcaed7ccec7d5d0bc68c54d0c934cb0e58f6a6c5a0fea128ae6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 5436 bytes
font_01_sfnt_off0000f106.bin
fd1cb36e2d9ba1f97dea159b764893771944ea636ff3dcec115cba8c9eb1586c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11120 bytes
font_02_sfnt_off000116b7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 4324 bytes

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