Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6be35d4776dbe3f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 09:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062444f363b07fa2ae0941bb371300b9 SHA-1: 72e5d2d1d04840352653cf10694269940b61bd68 SHA-256: a6be35d4776dbe3f25d3b51468a938d27fd43e31a18c7d1a5b82fc13a6105c9e
96 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, which detected it as a phishing trojan. The embedded URL points to a domain that appears to be hosting a lure for a syllabus download, suggesting a phishing or social engineering attack. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic indicate an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=mba+cet+2020+syllabus+pdf+download
    • http://bipowilago.mywebcommunity.org/nobit.pdf
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fe374e15bbbf.pdf
    • http://tafiwon.mywebcommunity.org/25805874160.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_601a202db0601.pdf
    • https://cdn-cms.f-static.net/uploads/4446781/normal_604ca4de21693.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://english-10.site/vukekodagowigemopirar5s543.pdf
    • http://zufunepel.iblogger.org/alphabet_tracing_worksheets_for_2_year_olds.pdf
    • https://cdn-cms.f-static.net/uploads/4427519/normal_606735030b638.pdf
    • http://usesol.xyz/95927011560lxj5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61107e29-8bae-48be-9f7e-93b1ba621110/mowamole.pdf
    • https://uploads.strikinglycdn.com/files/ec22cdfc-73bd-4151-9830-890cae1ac7c4/big_fish_grill_riverfront_thanksgiving.pdf
    • http://lenadupubop.rf.gd/duel_of_the_fates_orchestra_sheet_music.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/charles_bukowski_go_all_the_way_espaol.pdf
    • https://uploads.strikinglycdn.com/files/ee0ab01f-3b0e-44bd-97ea-371d64a9b4b5/harbor_freight_21_gallon_air_compressor_oil_change.pdf
    • https://uploads.strikinglycdn.com/files/f5cf709a-264c-4934-a1f7-4244554fc3af/how_to_restore_windows_10_system_image_file_to_a_different_computer.pdf
    • https://s3.amazonaws.com/wajibile/luxomuwu.pdf
    • http://kemesuxaw.myartsonline.com/gasemoxakunelesowewox.pdf
    • http://zijiwaras.onlinewebshop.net/the_collector_2012_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/816220fd-e819-4e6a-a737-b1a7fcd3c5a6/how_to_check_if_a_zener_diode_is_working.pdf
    • https://s3.amazonaws.com/fajetufekejo/android_tv_stick_iptv.pdf
    • http://xifawuzegeliwag.rf.gd/63406630001.pdf
    • https://s3.amazonaws.com/wizidimawag/magufofozuriba.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_off0000ee0f.bin
05e945d67edbea11fb6c2368809ce87ea92d85a885a3b2afba8d683b5773b0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 5668 bytes
font_01_sfnt_off0001018d.bin
adaa53fc487776a5e1a7dbe0ce70fd0a2d24ef0b48818148d03d3a74fd9f3bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 10904 bytes

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