Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b86bedd55ce932…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 01:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 935ade6b27fb9c41d338971984c717f1 SHA-1: 8041f268cb9d2d9fdb00e658bd0531ebe02bbc2f SHA-256: 97b86bedd55ce93298bf4a79f1440a4706a52588ea16f9adda6258b54981486d
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'vilenefex.ru', which is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, suggests a lure related to Adobe Acrobat, a common tactic for social engineering.

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://vilenefex.ru/award?keyword=how+to+use+adobe+acrobat+9+pro+to+edit+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff8c566edcb5.pdfIn PDF document text
    • http://com-servers.online/revosatovarididibawijlns7b.pdfIn PDF document text
    • http://yazansoft.com/ayurveda_pg_entrance_books_freea1ujx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6017085f9af1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_60595857b5d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_6023d81575a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_60592ac28d5e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe37694-1a8b-47d5-84e8-f941bc6ff6ec/xizof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f7010d-e589-410f-a67b-9c30d028a65c/bijokezilokuf.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/fender_audio_passport_conference_s2_portable_pa_system.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/marissa_mayer_cv_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/tonemugej.pdfIn PDF document text
    • http://rimutapewite.rf.gd/what_is_cfa_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898cc22e-b013-40f8-9009-35eaf32bab8f/mountaineering_club_seattle_events.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/bevars_naa_songs_com.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/71710890166.pdfIn PDF document text
    • http://kavanovadegutok.rf.gd/nipeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/knight_desecrator_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a04dd6-64ca-40b2-bce0-5c1184406927/40730837191.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/4471431579.pdfIn PDF document text
    • http://nadusapawamuj.epizy.com/architecture_n_tiers.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/nuxomitinivumumarof.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_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 5468 bytes
SHA-256: fa5c9d6177cff9f2b63a97ec1225b3c3ab1a44a556e5f867ca91a343a7387e5f
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 10984 bytes
SHA-256: 067ac3d5a41276dea27053bfaa2345ac086d2fa376ae50c30713b7a185d1b3df

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