Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb28bb7d78da859…

MALICIOUS

PDF

74.8 KB Created: 2021-05-13 01:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ec5ab77be2022026e04df3d9df09c9d SHA-1: 12706bc5de20db0946656cf9376b7042042c2913 SHA-256: 7bb28bb7d78da859f76c695f96dfef744cebea94cf86bde08ae1a028d51142f6
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs strongly suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/strik?utm_term=workday+meaning+merriam
    • http://storezone.info/biodata_form_printablelch70.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/wowokazimore.pdf
    • http://1ux.site/976181883stw4s.pdf
    • http://bigwin-1xbet.fun/zemitabag98p8.pdf
    • http://pixujuxe.mypressonline.com/arrays_in_c_tutorialspoint.pdf
    • http://wafolifinibi.22web.org/rotixapusojatogevujum.pdf
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/8654698.pdf
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/sojekavixafap.pdf
    • http://tuzojexis.mypressonline.com/fixepuxunofud.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/nojuxolor-juwenekosif-dizekiki-nupisasiva.pdf
    • http://dontbeshy.xyz/87261306463f6uca.pdf
    • https://pixereboxos.weebly.com/uploads/1/3/1/3/131381799/b72036a41db0.pdf
    • http://cashthe.ru/creative_visualization_meditations_free_downloadcnslp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuzafuzeruwit/malayalam_story_for_childrens.pdf
    • https://s3.amazonaws.com/rumezo/monogonukepezevofigowu.pdf
    • http://pusapovewazigu.onlinewebshop.net/96866110141.pdf
    • https://uploads.strikinglycdn.com/files/6bbb1c3b-d160-4b2e-adb1-2aee91c930ea/price_comparison_chart_template_word.pdf
    • http://poduzamilikuki.rf.gd/alcalosis_metabolica_y_respiratoria.pdf
    • http://beguresenoraw.epizy.com/ssc_mts_delhi_admit_card_2019.pdf
    • https://s3.amazonaws.com/rodiligarexo/total_coliform_bacteria_symptoms.pdf
    • https://uploads.strikinglycdn.com/files/be8e4441-908d-4fe9-9fe7-6ca7a7bab46a/puestos_del_trabajo_en_un_hotel.pdf
    • https://s3.amazonaws.com/naxozelozude/dell_optiplex_790_cpu_fan_replacement.pdf
    • http://tabizamasozelo.epizy.com/what_is_knowledge_management_systems_kms.pdf
    • http://tinosizifaxuful.epizy.com/movazufigijiwas.pdf
    • https://uploads.strikinglycdn.com/files/0bf9473c-a3da-49af-9aef-d0cebed7104a/consider_phlebas_reddit.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ad.bin
d861231c3559bd74379cf262d55f7dca38480cf84ef361f94ccfdc1ad3d2ca09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 5112 bytes
font_01_sfnt_off0000e711.bin
8409fce7cd7373a3ad842f5174b030b139205777ccb5bb485683dcb66464c002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 5452 bytes
font_02_sfnt_off0000f8d2.bin
65b3fd6a67bef89a2fc0d8df4c03c2d0535c32ecc6236a1427724727530848ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10688 bytes

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