Malicious PDF — malware analysis report

Static analysis result for SHA-256 0884b2aa63b70220…

MALICIOUS

PDF

79.2 KB Created: 2021-02-24 11:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5566606cd10e0790f098a83c621aff9 SHA-1: 24851a60b5c900d2cb9ad4b1feb862369d65553f SHA-256: 0884b2aa63b70220ecda0b8f0e19998521cd089e5da3421d72f8188c5b969edf
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, when visited, likely leads to a phishing or malware download site. The document body, though heavily obfuscated, appears to be a lure related to academic information, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=what+gpa+do+you+need+for+mcgill PDF link annotation
    • http://excschool.ru/rikimey4w7d.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/rowed.pdfIn PDF document text
    • http://alisaborodaenko.design/color_cars_games_monster_truck_coloring_sheetsn9ayr.pdfIn PDF document text
    • http://hookup158.fun/birthday_song_in_tamil_videok7m5g.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/34455799252ywbns.pdfIn PDF document text
    • http://ital-tess.space/751857149412bo0d.pdfIn PDF document text
    • http://fifamarketbot.com/fitufosorih6e9.pdfIn PDF document text
    • http://interplast.ru/begum_rokeya_university_admission_form_2018-_19gjxky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lazolu/captive_prince_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/hr_annual_training_plan_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/wazosasukopuxijulabak.pdfIn PDF document text
    • http://nimunofat.epizy.com/avg_free_for_android.pdfIn PDF document text
    • http://viveguwoxifug.epizy.com/narefuwinek.pdfIn PDF document text
    • http://sigamit.epizy.com/sample_answer_to_complaint_with_affirmative_defenses.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/60296631164.pdfIn PDF document text
    • http://zaruxokogidut.epizy.com/rilenekubu.pdfIn PDF document text
    • http://kowogipat.epizy.com/ahlam_hb_bravo.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/81550595179.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5388 bytes
SHA-256: 55866e4ff98dc10dffbc1fbf421fe4ba60ee41ca98bed48b20e1e6cf3e21a3ff
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 10944 bytes
SHA-256: fa614c51a1923991d9457277df81a4f49fd9873d71eaf6cf828245db794edad4
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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