Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f252f28a1756a8d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 11:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88f28071b5b0a7cf18006eb2f7f3f258 SHA-1: d2a9916328fc33e49331a1fea19dde0b67108375 SHA-256: 7f252f28a1756a8dd511cb64119d97d109478a79058b0962c20cf94bd4fa0ebc
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, appears to be related to educational content, likely a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/wix?keyword=geometry+10-6+worksheet+answers
    • http://kusulapezep.iblogger.org/ninadavewaseluriloberamad.pdf
    • http://forumapu.iblogger.org/what_is_the_best_lock_picking_set.pdf
    • http://vekogevev.22web.org/40647660611.pdf
    • http://kunozoxutokusu.mygamesonline.org/xenukenofetata.pdf
    • http://kikifikoxije.mypressonline.com/what_is_daybed.pdf
    • http://kujamemapevubu.mypressonline.com/71925323438.pdf
    • http://dijawobal.iblogger.org/what_was_the_theme_of_flowers_for_algernon.pdf
    • http://pagavopalubutu.scienceontheweb.net/malokeko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mikibetiv/watatejupepu.pdf
    • https://uploads.strikinglycdn.com/files/024a71c7-b884-4b1b-9001-2d1e95bc2e73/xibenexage.pdf
    • http://zirafefovijab.epizy.com/kutonoduwutekufubalav.pdf
    • http://befakas.epizy.com/guxifogotobavasejap.pdf
    • http://rosajeku.myartsonline.com/gregor_the_overlander_series.pdf
    • http://volenivojox.epizy.com/how_to_draw_a_dog_with_a_bone.pdf
    • http://fotopokidag.epizy.com/tixanikivofovefobukem.pdf
    • http://tewejip.rf.gd/37118457538.pdf
    • http://tuxugev.epizy.com/impetigo_herpetiformis_case_report.pdf
    • http://bukazud.rf.gd/17654873445.pdf
    • http://sunuwib.epizy.com/heart_rate_blood_pressure_and_exercise_answers.pdf
    • https://s3.amazonaws.com/resixexi/lajonupiwopudowupusifu.pdf
    • https://s3.amazonaws.com/kufazete/12868857161.pdf
    • https://s3.amazonaws.com/rivazixexuguri/25933420942.pdf
    • https://uploads.strikinglycdn.com/files/790e4ec3-929f-415b-8257-8581cdf2a54d/the_night_manager_season_2_dvd.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_off00010026.bin
840f799fef553f99adfb67de3539a898990a8823239398eacdde6a0fd69c5732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 5564 bytes
font_01_sfnt_off00011316.bin
5294eab10350d217bee7a482b9bc3f471080e3844fb72cb2f6f4b520b8958de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 10240 bytes

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