Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7ec8b51641011b…

MALICIOUS

PDF

109.3 KB Created: 2021-03-20 02:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4776d0e38f3230022770bfa9da9afdeb SHA-1: bacfb2add3c8132edf46c00fadcb95232bfc56b4 SHA-256: ac7ec8b51641011b148dbb034f243ed11fdd5dd76f2e92d30d7005efcb473109
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is a common tactic for phishing lures. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=5.3+862+head+specs
    • http://kixiwogazu.sportsontheweb.net/vuxobeziguwuduruve.pdf
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fec5b16680ab.pdf
    • http://jofijuke.22web.org/discussion_paper_guidelines.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_604de20cae632.pdf
    • http://sopafekidis.sportsontheweb.net/32810118142.pdf
    • https://cdn-cms.f-static.net/uploads/4449602/normal_6043089ee52a4.pdf
    • http://fanisore.sportsontheweb.net/venn_diagram_definition_math.pdf
    • https://cdn-cms.f-static.net/uploads/4425533/normal_603a90b82da17.pdf
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5ff3fc43df0d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_134e3f83239c4d07b1ac16307ae11dab.pdf?index=true
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_e1687dc3b2bd44b5a8632d879e6541a8.pdf?index=true
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_165a5013f3e2484aba622c2a7175e136.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/wumekuwe.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_04e33504e1ad43cabba9be29b753227d.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_409c12d1f51b42cd89bf84cd64e857a6.pdf?index=true
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_ce8d67ce55a84742aa076e00cf7a5756.pdf?index=true
    • https://s3.amazonaws.com/nezanurugega/57763507882.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_3516ff2951794c0cbfa05ffaf84dd39e.pdf?index=true
    • http://nabesazuxipuf.epizy.com/ielts_speaking_test_part_2_sample_questions_answers.pdf
    • http://menimilerawapo.rf.gd/38846862472.pdf
    • https://s3.amazonaws.com/tuzakifezara/87700855089.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/73401862989.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_off00016d9c.bin
f3a5564813c5f0ca5512ba3de54e3cf8ca9cf51048f9dcfff081dc8bd0be0129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9C 5736 bytes
font_01_sfnt_off00018123.bin
8cef60721c08f519af1919969a3e4eb6fa519595f217b29c77cbc124018c04a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18123 11452 bytes

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