Malicious PDF — malware analysis report

Static analysis result for SHA-256 31648b4536b7c577…

MALICIOUS

PDF

94.2 KB Created: 2021-04-30 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91843a81f7afbf3e16cb643192879476 SHA-1: 000212f25aef50ecd0b65e0a7dd7d637f89b8a02 SHA-256: 31648b4536b7c577bc791739390b56cab19e4a073ff7191ac962fb6b0ae9e151
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, 'seumenha.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=are+bodyweight+exercises+good+for+fat+loss
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/6c072a73729.pdf
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/lizazow.pdf
    • https://kodusikur.weebly.com/uploads/1/3/1/6/131606179/fanuxugavov_latatadakan.pdf
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/litubuv.pdf
    • http://kasaxeko.mypressonline.com/24381557511.pdf
    • http://mugukix.mygamesonline.org/feng_shui_2020_for_pig.pdf
    • http://italysummer.space/life_fitness_lifecycle_gx_exercise_bike7w4l0.pdf
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/zujizadeladazimaxewe.pdf
    • http://hookup757.fun/is_extinction_more_common_than_survivalk63kz.pdf
    • http://ig-soft-team.com/duxanibuzefojoroweteo12c.pdf
    • http://kusafomidufe.mywebcommunity.org/anaerobic_respiration_in_bacteria.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pojikovewijeja/argumentative_essay_samples.pdf
    • http://fudewalazakukug.epizy.com/advanced_transport_phenomena_john_c._slattery.pdf
    • https://uploads.strikinglycdn.com/files/03b767d7-3e1e-406d-83af-04df46a2e016/what_are_the_4_agreements.pdf
    • https://uploads.strikinglycdn.com/files/e4351b74-76f4-4634-aea9-408a65d6fcbf/wefavadobaxanogip.pdf
    • http://winexuxipowef.epizy.com/tinalelisafevuwerotoke.pdf
    • http://logiweliziweje.onlinewebshop.net/administrao_pblica_patrimonialista_burocrtica_e_gerencial.pdf
    • https://s3.amazonaws.com/woneketelak/fluoroscopically_guided_lumbar_injection.pdf
    • https://uploads.strikinglycdn.com/files/3978b12f-14e6-4c5a-8346-93bee4674630/bidisusitos.pdf
    • https://uploads.strikinglycdn.com/files/acb504d2-21bc-4695-b7b2-53db61dc469c/77831789086.pdf
    • https://uploads.strikinglycdn.com/files/82bd51cc-aa9c-4209-a8e4-2ed4053823a1/best_sat_preparation_books_2020.pdf
    • http://dusijilesa.rf.gd/payroll_system_proposal.pdf
    • http://kofepiropi.onlinewebshop.net/wixokulipusakofeg.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a28.bin
0adfda78405c68337e8854fbf5163adf8d97b7c6e441e9214b9f40782a138ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 5672 bytes
font_01_sfnt_off00012d91.bin
1309b94e4b838281cd3bf287d442be265c4007888e7ada0029e2b9722bec7af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 11560 bytes
font_02_sfnt_off000153c8.bin
f06c3c3c43f7997c9f6f0b66640fe1f7583718a70cfdaf2ecd2ed754be14aff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153C8 16636 bytes

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