Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1d3dc71efba94e…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 17:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eecdd159eb6f80ec6b925f79ef323b2d SHA-1: 9ee2e154587140b1c665f740abcb139743d24f23 SHA-256: 9b1d3dc71efba94ed8554662bc5c503d235f2b0223c7ceddf7b118cf0b5c868a
96 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 a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=motivation+worksheet+for+esl+students
    • http://farvestnn.ru/gevipobebotuxirewumoxyk5a.pdf
    • http://soldonlakewood.com/kuwogu8yyl2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fadobirak/wadozevafuzavux.pdf
    • https://uploads.strikinglycdn.com/files/f2753128-0edd-48a2-afe2-d922425bdc73/67905154904.pdf
    • https://s3.amazonaws.com/gagotaniwipure/vuzomativerusuwevolokeg.pdf
    • https://s3.amazonaws.com/jitimesolagun/believer_lyrics_free.pdf
    • https://s3.amazonaws.com/foneniz/taxonomy_classification_and_dichotomous_key_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/17726e9a-aef5-4a3d-abfa-70b855ceb420/which_plantronics_headset_is_the_best.pdf
    • https://s3.amazonaws.com/satuja/kagaxefugo.pdf
    • https://s3.amazonaws.com/mawesenasijoser/bsr_dmard_monitoring_guidelines.pdf
    • https://s3.amazonaws.com/wopari/audiometria_verbal.pdf
    • http://vomewudige.atwebpages.com/kijepejizozisezanob.pdf
    • http://gonegexunu.myartsonline.com/name_four_characteristics_that_all_living_things_share.pdf
    • https://s3.amazonaws.com/silubebebefuju/bitexubamonanuf.pdf
    • https://uploads.strikinglycdn.com/files/da80eced-e8d5-4461-a6c2-637a0ba0caff/how_long_do_nimh_batteries_last_in_storage.pdf
    • https://uploads.strikinglycdn.com/files/a5a2bfc0-69ad-4260-af39-51287bae5978/how_many_lines_does_banquo_have_in_macbeth.pdf
    • https://s3.amazonaws.com/widofafane/toro_electric_start_snow_blower_problems.pdf
    • https://s3.amazonaws.com/vuliwisuwig/customs_clearance_procedure.pdf
    • https://s3.amazonaws.com/libusamagowuvo/motivational_interviewing_strategies_and_techniques_rationales_and_examples.pdf
    • https://s3.amazonaws.com/tanikanaw/wonderful_tonight_full_song.pdf
    • https://uploads.strikinglycdn.com/files/95588cfb-7da8-4cb9-a1ec-cec432dd7de8/download_and_install_big_fish_games_manager.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_off0000eb31.bin
e9a3db9ca1005f8cc148024e648195f7ad60f38185bb3abf32888d768997a63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5096 bytes
font_01_sfnt_off0000fc93.bin
a1dc5fddb836b8014f7d8faddcbb1b1543c5e34d0072290e24ed2cffa88a9c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10376 bytes
font_02_sfnt_off00011ff2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 4324 bytes

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