Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b6bf662e4632b1…

MALICIOUS

PDF

74.6 KB Created: 2021-03-10 01:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51b6769cebd5dc035513be78a08f7e92 SHA-1: 20299dfc50d3034b2927253685c89e7b199442d3 SHA-256: b7b6bf662e4632b1afcc961db7b69da419f59d79dda9f18607c40606780218c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, suggests a lure related to 'aluminum alloys and properties'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=list+of+aluminum+alloys+and+properties+pdf
    • http://pressit.space/what_does_chi_number_stand_for_in_medical_termsc2w41.pdf
    • http://tronreserve.online/proporcionalidad_y_porcentajes_6o_primaria_ejerciciosb05x4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorapobuk/matrix_multiplication_questions_and_answers.pdf
    • https://s3.amazonaws.com/napejaxosinages/2017_kakao_mobility_report.pdf
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_622e0c6400624f4597ff4a74648651a5.pdf?index=true
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_033131998fae4f1ea3d45d7a13fb79cc.pdf?index=true
    • https://s3.amazonaws.com/dejolavubukugeb/janesville_car_accident_reports.pdf
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_75ba9446dfec4b78808d98736926f3af.pdf?index=true
    • https://s3.amazonaws.com/roxawo/zijigigonasavejujuxigoxo.pdf
    • https://s3.amazonaws.com/kobivimelelo/jatoxavopodopi.pdf
    • https://s3.amazonaws.com/lomogas/datiralovubukabinonir.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/tapogasukeju.pdf
    • https://s3.amazonaws.com/sorogamat/47126312056.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_7ec936ac530f4c8bad75efd4554fa3e9.pdf?index=true
    • https://s3.amazonaws.com/xoxaneral/9256643521.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/kewirodu.pdf
    • https://s3.amazonaws.com/jenagubadopi/master_mission_fgo_guide.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_off0000e74b.bin
d51bf08299efe9bfcdf9b689347860cf9be065070c4f92f982fba50a04e82e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 5228 bytes
font_01_sfnt_off0000f90f.bin
ae05d0f2778d0f3e090e27d0fc8c84b5b8867054d0868f3cb8111186c631d11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10460 bytes

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