Malicious PDF — malware analysis report

Static analysis result for SHA-256 3539817f2d354ace…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 11:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c850d94d0451fccf40298c676b582669 SHA-1: 55d10688c96c6dc5283fa66b1e3b3a612fd20ca7 SHA-256: 3539817f2d354ace3e20795217e35f6d226ef371925672918bb106aec362aadb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/wix?keyword=lens+practice+worksheet+answers+physics+classroom PDF link annotation
    • http://kiladuwujufuzav.22web.org/49719405469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukajevo/4443375412.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/meloviromewuwiximar.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/91791131808.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_1476c37727f04eb09fcccfbcc1a0ba1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/list_of_connectors_for_writing_task_1.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_6fd2fd4164f941ed8904c5cd85b36424.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_3c0d4282d2f94e41814a68b2dfe3c64a.pdf?index=trueIn PDF document text
    • http://tirejazanapo.epizy.com/43044627059.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_b645813ae4c34b43a979be5609e067ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/zefunebatoz.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/busuu_premium_apk_android_4.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/42920346627.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/lukasozobibimamor.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_bc7c7dc56fba4adf86c989a4b7fbeec5.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_6572a7c35b8f4649b04ed15c94999530.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zulezov/5477534438.pdfIn PDF document text
    • http://dubaduvuk.rf.gd/the_pictorial_key_to_the_tarot_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/abu_garcia_black_max_spin_combo_303fd_802ml_8-30g.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/virology_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/44570901847.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/lagazarolubenotep.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/narasimha_movie_dialogues.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_51804b766dab47a5835237a0dd7a3679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/migegononuvasakulepudom.pdfIn PDF document text
    • http://pagitewuzowika.epizy.com/beintehaa_serial_title_video_song.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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5372 bytes
SHA-256: e99bde499611f09acdef85479187a27c2169e792c0883f880dc30fbf211ce2ee
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11096 bytes
SHA-256: 3d5f617c74009d7357ae0c9e087580a666c779975d030cb7d3bb42fee72c9445

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