Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9ad76a26f529c5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 01:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037a3d99a03c4496aaa272a68d465bb6 SHA-1: 758b58193a15165133275a07ccdd3683a253ca70 SHA-256: 8d9ad76a26f529c51423a8670c570492272b9abdf00690ee9a0ac8eff638672b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. It employs SEO link farming by embedding numerous external links, disguised as free downloads for sheet music, to potentially lead users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to further malicious resources.

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-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://jacksth.ru/award?keyword=a+thousand+years+piano+sheet+pdf+free+download
    • http://nulonelam.66ghz.com/cbse_ugc_net_online_form_2019.pdf
    • http://vozujuluxe.iblogger.org/xupurugogewefagigubudasu.pdf
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/gosuzir.pdf
    • http://lozajakar.iblogger.org/15098534461.pdf
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/ranukegatovakoz.pdf
    • https://fofumugu.weebly.com/uploads/1/3/4/4/134445246/80d1afd70ee1715.pdf
    • http://gejopuzebizovuk.iblogger.org/anexos_do_simples_nacional_2018_em.pdf
    • https://dowanudamedi.weebly.com/uploads/1/3/1/3/131398164/posowefomimavemisi.pdf
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/91ffdf73c25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_7aefe3ade33a49648a689d8230311765.pdf?index=true
    • https://s3.amazonaws.com/sirilagewuga/zepidamiwufafop.pdf
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_7838bb13b57249e1ba10d6eae1d8666d.pdf?index=true
    • https://s3.amazonaws.com/mesotodimus/motion_graphs_3_worksheet_answers.pdf
    • http://tunozesanapi.rf.gd/binary_to_decimal_conversion_worksheet.pdf
    • http://wetovokerug.epizy.com/rome_metro_station_map.pdf
    • https://s3.amazonaws.com/degisapemifa/baahubali_2_movie_songs_free_starmusiq.pdf
    • http://depebovibu.epizy.com/acronis_bootable_iso.pdf
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_905b9168ce49456392c6fdcb095bb8d3.pdf?index=true
    • http://melamepapate.rf.gd/15138321885.pdf
    • http://zuzofigub.rf.gd/raees_film_song_3gp.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_70ddf96bb31a41d688c9b3c86e23b076.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_710139cffe5c4afcae69c841a6e71c31.pdf?index=true
    • http://zubimox.rf.gd/actual_time_sheet_meaning.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_off0000e8f1.bin
0d1f0c466dc33440e512fb5a5daa921438cd3d1d6eac0ded2b474b0981c0db57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5192 bytes
font_01_sfnt_off0000fa9f.bin
b344019d6f34bd021678c4d9c0a53656f509f2e6607d716e2e9cbc87d8d6f402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11672 bytes
font_02_sfnt_off00012298.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 4324 bytes

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