Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff10a45b8c122b2…

MALICIOUS

PDF

267.4 KB Created: 2021-03-20 20:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1a028815c03c5c2c67c834e875e149a7 SHA-1: b0017789dc7197c263684778ec2c25a0ea90d4dc SHA-256: eff10a45b8c122b2112276987e6193bc688aa890ecf717599b5ea7255c6b0636
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains multiple embedded URLs, with the primary one being `https://druttle.ru/123?utm_term=warhammer+40k+tyranids+8th+codex+pdf`, suggesting a lure to download further malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

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://druttle.ru/123?utm_term=warhammer+40k+tyranids+8th+codex+pdf PDF link annotation
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/1857766.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/be02e23f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zesuxetirano/jFhfn0P/kiluvoboso.pdfIn PDF document text
    • http://bigswinner.space/worksheet_periodic_table_trends_answer_key8cvwx.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/7ihjjii/thumper_girlfriend_plush.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/viiiaha/frontline_assassin_commando_call_fps_duty_game_2019.pdfIn PDF document text
    • http://dithetsen.xyz/bitavejezodumulotalenuzj7mup.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/ifrIgi5/road_to_legend_rules.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/nisixoki.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/jjbyUjb/68512193132.pdfIn PDF document text
    • http://voiprormul.xyz/folumajuwigavigaxitopi9mma5.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/jMhhvji/new_english_song_2018_mp3_free_download_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/IjjrjdI/poboxute.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/aRihhe0/hay_day_online_para_pc.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/filmywap_war_full_movie.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/jeneba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumeweb.rf.gd/98905238457.pdfIn PDF document text
    • http://mopuriruwinufi.epizy.com/38002074007.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/ap_biology_exam_review_answers.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/29845313108.pdfIn PDF document text
    • http://wuwedutukuw.epizy.com/52239705973.pdfIn PDF document text
    • http://sapokumafunu.epizy.com/algebraic_expressions_worksheets_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E3B7 6032 bytes
SHA-256: 72e5d7f8d7ff9bcfc2197032d6867a67a9b22837793e988fd1a3e583829cdb7e
font_01_sfnt_off0003f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F83E 10956 bytes
SHA-256: 2d0e2295dce393fb893ec1e2168e71ce28a8109045db2c3090d1226fd8000202

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