Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c4e93fda90bd48…

MALICIOUS

PDF

73.5 KB Created: 2021-03-17 00:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71ecc024be1b284474914599a784a5d8 SHA-1: bba415070acd85c1cd5713383f9e89374b71ddef SHA-256: 35c4e93fda90bd48a1cc6a1fe918e5dd0ec3873196ac16387587373ef903d683
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, contains text related to 'background color code android' and the wkhtmltopdf application, suggesting a lure. The embedded URLs likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=background+color+code+android
    • http://stepka2016.xyz/mbti_chart_animeteieq.pdf
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/xosusugopi.pdf
    • http://iminn.ru/adding_and_subtracting_rational_expressions_worksheet_precalculusn7n0v.pdf
    • http://tiktokcopyrighthelpteam.com/how_to_forecast_income_statementt3mi2.pdf
    • https://fixefukazadutux.weebly.com/uploads/1/3/1/6/131607703/xegudesopovi_xonizik_rebumaluv.pdf
    • http://prizinsta.info/jejunal_arteriovenous_malformation_icd_10yv6cz.pdf
    • http://easy-money-cash.space/6920498316rfhoa.pdf
    • https://cdn.sqhk.co/zasokolof/dibuhcW/tinoton.pdf
    • http://hesap-al-sat.com/simufugubcjk8s.pdf
    • http://petersikdar.com/quantum_chemistry_levine_solution_malr077.pdf
    • http://lojasamericanasbr.com/zuposoxqtlit.pdf
    • http://forkidsshop.online/how_do_you_describe_the_phases_of_the_moonzmyrh.pdf
    • http://yewes.fun/what_does_the_word_pax_romana_meancmgi5.pdf
    • https://cdn.sqhk.co/lepavenujal/ehjibgj/township_game_helping_hand.pdf
    • https://cdn.sqhk.co/dexediwiboze/dojhsic/modern_sofa_design_wooden.pdf
    • https://cdn.sqhk.co/viwedanej/4qeujhK/woputujos.pdf
    • https://cdn.sqhk.co/fipimomozuk/Sgd5pjf/computer_keyboard_shortcut_keys_a_to_z.pdf
    • http://tiktokhd.design/fipuguzotoz0z.pdf
    • http://1xbet-sportstavki.fun/8187478245tmhfn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeponodij/gavaxizape.pdf
    • https://s3.amazonaws.com/xeropizuwe/subject_and_verb_agreement_quiz.pdf
    • https://s3.amazonaws.com/watajive/71381830189.pdf
    • https://s3.amazonaws.com/tokatefozude/59026960226.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_off0000df4c.bin
74e6ce57c3a47f17890cc59881d9cac6d1dfb5d6c2140f5b904d4e20c1fa4229
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5040 bytes
font_01_sfnt_off0000f082.bin
32f9f1fd86b42fb39e5e48e32dddca9a91cd1f297e73a4c2fc2836ee2e758e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 11236 bytes