Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae833ca3636354…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 21:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e0ff75e853cbd58fea8495818697a1c5 SHA-1: 21af4182c6966e2161e01478fed89ac78c9737d7 SHA-256: 37ae833ca36363547e92f236d7f061920b9fe7cc983f1008016e1e60355cc888
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one directly leading to a suspicious domain ('baarspo.ru') that is presented as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=how+to+raise+basketball+hoop PDF link annotation
    • http://help-bluebadgecustomer.com/bulleit_bourbon_whiskey_ryevv7un.pdfIn PDF document text
    • http://salea.site/aboriginal_dreamtime_stories_creation_of_the_universe30v81.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogojo/geI3Oic/love_story_book_cover.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/which_processor_is_best_in_i5.pdfIn PDF document text
    • http://inmyshtangen.xyz/lean_daily_management_tools0t4we.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/wijgd3C/mad_dex_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fepixuzutol/jfhhifn/idle_theme_park_water_slide.pdfIn PDF document text
    • http://bestunew.xyz/molamefosuxurowntwws.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/Gguhazd/onkyo_hf_player_iphone_review.pdfIn PDF document text
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/kolatubefazeletaj.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/lakadutof/best_cordless_phone_system_with_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/8685749521.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/six_sigma_prioritization_matrix_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/gupogeboda.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/ruvapenaxasog.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/87643547557.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/gidorelufosilod.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 4848 bytes
SHA-256: 50ef426f11e9ef814a337de42cc917dfef080b8972e7ff7c726df7b7a2cf48ae
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11072 bytes
SHA-256: e340cd06ecd74897ec40c969c287522c64374402e2c45ca5661ab7ba0d1678d5
font_02_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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