Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42073278cbbfcc1…

MALICIOUS

PDF

80.0 KB Created: 2021-04-15 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4adce90186043db1c359a2ff1256ca3c SHA-1: 77fe59a75b3075fdc47179b93dd443a9f87005dd SHA-256: a42073278cbbfcc1fbfcbc5e3c4ef7435cac0dd2e418299f650f9f275a9e2e4a
156 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, indicating a phishing or trojan threat. The document body contains a lure related to 'League of Legends' client issues, and the PDF exhibits a large number of external links, characteristic of SEO spam or phishing campaigns. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=league+of+legends+repairing+client+stuck
    • https://cdn.sqhk.co/butuxolevu/t5yYQih/famous_90s_alternative_rock_songs.pdf
    • https://cdn-cms.f-static.net/uploads/4478422/normal_602cfdcc21e28.pdf
    • https://cdn-cms.f-static.net/uploads/4495846/normal_602c60230a1d2.pdf
    • https://cdn.sqhk.co/jadepibake/6ihihIM/fetekubotefexukiwabebodil.pdf
    • https://cdn.sqhk.co/kofuvufexo/UVm3qPO/lakosijufegunexovukosivos.pdf
    • https://cdn.sqhk.co/befozaxulot/hUhbRca/does_my_crush_like_me_quiz_quarantine.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_600d87e282091.pdf
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6011ece392a13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_4f9c8637c7b74515858b49f2b818a1c2.pdf?index=true
    • https://s3.amazonaws.com/fopalew/35294234760.pdf
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_14cc48574d574324ba4b094bc6759112.pdf?index=true
    • https://s3.amazonaws.com/zosevid/ponebexariwemudamiwazapur.pdf
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_616a23a4a2de4fecb671684e24360e7a.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_fb5cfb42a6204aae823fa6bbe448168a.pdf?index=true
    • https://s3.amazonaws.com/vabedafozo/ejemplos_de_aplicaciones_de_la_trigonometria_en_la_vida_cotidiana.pdf
    • https://s3.amazonaws.com/jujojomojemiz/96796055375.pdf
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_0ad4073421de4f49a416c8a3a9b47a56.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_6098dbe79af04675a7a2f4f34851a64d.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_942e59808e164ce589a6dda905a62e99.pdf?index=true
    • https://s3.amazonaws.com/naxozelozude/calculus_ii_lecture_notes.pdf
    • https://s3.amazonaws.com/tanikanaw/cooloola_camping_report.pdf
    • https://s3.amazonaws.com/dakebesuvum/mental_status_exam_nclex_questions.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_45b44f133eee4bb992b8b761b5c3cfa2.pdf?index=true
    • 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_off0000ec23.bin
f9416791d92fdc991636508a211574665707086d8e0d2526024e49b5cc682686		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5208 bytes
font_01_sfnt_off0000fdf2.bin
19e898703b0b5ec65f86ed9acbcda26d1c75cdb05c4b8bfe5b1f5beb65befe5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 11228 bytes
font_02_sfnt_off0001243e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 4324 bytes

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