Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9503072bfb68865…

MALICIOUS

PDF

79.4 KB Created: 2021-03-06 11:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8181a974a432156c95c3eda5bf424c0 SHA-1: 0f0e570f075cbf7e861bcb1a45560dfde8576ee4 SHA-256: b9503072bfb6886508f71c49c97d73c8bf5b75f7da4f1a2e1509202e86a0d1f3
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The embedded URL, 'https://golowaki.ru/wb?keyword=sat%20math%202%20practice%20tests', is presented as a lure for 'sat math 2 practice tests'. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://golowaki.ru/wb?keyword=sat%20math%202%20practice%20tests
    • http://trend-sales.fun/libros_de_inmunologia_gratis6zwi0.pdf
    • http://fl-shop.xyz/swords_and_sandals_5_redux_free_download_pc4vyx4.pdf
    • http://limons.space/clicker_heroes_clanto8mt.pdf
    • http://soldonlittleton.com/92845814708dakr2.pdf
    • http://reduslimitalia.site/how_long_does_walmart_cashier_training_takeqahyx.pdf
    • http://poroda.site/zilabijebufawtqa.pdf
    • http://notdull-eng.online/how_to_use_nighthawk_as_a_repeater9xd1z.pdf
    • http://stassikorskyi.com/542384353289g3kk.pdf
    • http://myyshooop227.site/fokubasasulobevusunnvyop.pdf
    • http://italywom.space/detox_program_for_weight_loss_in_nigeriat1f6o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gudukupir/83353154828.pdf
    • https://uploads.strikinglycdn.com/files/92411f2c-7293-42b9-ba1d-834b9a39fe2f/why_does_my_energizer_battery_charger_blink.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/53297691771.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_b1ba445bfe4846a7a817ccf5ccb09fd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41b6cf2d-b4f8-420b-99bc-8fcd5469866c/52581225468.pdf
    • https://uploads.strikinglycdn.com/files/b1a59f49-470b-4de9-84b5-9c10bd035994/zunafepitefixerig.pdf
    • https://s3.amazonaws.com/rubidokezive/sidimuguvebodas.pdf
    • https://uploads.strikinglycdn.com/files/e18664c6-aa38-439c-99b1-79e008423469/25587680969.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_6e1007124e3f49439200a36790fe6fc8.pdf?index=true
    • https://s3.amazonaws.com/jezekemunidup/nixubigodijilupasunixavir.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_c7f34d5bb35d4793b7545d41b1dba394.pdf?index=true
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_cbe9ac5b943f48a1a6da4ead0ec68d35.pdf?index=true
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_50d7fe85547c42deab9c8c68523bf531.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/kovuzoxomilesilugojagajij.pdf
    • https://uploads.strikinglycdn.com/files/586d76f7-a3d2-4d47-957b-779b1bc29e56/as9100_rev_d_lead_auditor_training.pdf
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_a5d3ff351967429c8633f400e8aae717.pdf?index=true
    • 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_off0000eadb.bin
f5d1935b5adc5c15efb82811c74775c9220a17b9f21460553022f4309e23e315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 4948 bytes
font_01_sfnt_off0000fb9f.bin
11596a1b2498dbb4745d645608bb220ec7f396351872e216d049c738d638ab06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 11232 bytes
font_02_sfnt_off0001221b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 4324 bytes

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