Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f115636d5f80b69…

MALICIOUS

PDF

80.6 KB Created: 2021-05-06 01:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aca52acd8c03a6ec11d00c19cd14e29a SHA-1: 7a9e508d8402c851d51c5825b2a7884c37ce92a0 SHA-256: 7f115636d5f80b6959e991504da38d1e188d9cfa0d1d95e3b876f781bfeaee58
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to dafemum.ru. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a compromised site, likely for phishing or to download a secondary payload. The document body contains garbled text, suggesting it is not intended for human readability but rather to exploit PDF vulnerabilities or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=amc+10+2018+b In PDF document text
    • http://flebolog24.com/mupuvopodyjkj.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/h17ijeg/88175068214.pdfIn PDF document text
    • http://casser.xyz/jikedusibufunutepa5qfoc.pdfIn PDF document text
    • http://getsalle.xyz/dog_tie_template9bzqj.pdfIn PDF document text
    • http://talkme-news.info/toshiba_regza_42_inch_reviewujfen.pdfIn PDF document text
    • http://phulop.store/best_survival_books_for_young_adultsz4m6i.pdfIn PDF document text
    • http://ig-copyrightnotice.com/menezurawefwq4wg.pdfIn PDF document text
    • http://belkwigs.com/zetaxetorenbdq20.pdfIn PDF document text
    • http://kanshoper.site/wupilonegupam3xx4y.pdfIn PDF document text
    • http://opit.space/house_electrical_symbols_for_drawings0g6t0.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/JgdjgK5/vedevemazanokaj.pdfIn PDF document text
    • http://just-gopro.com/stock_car_racing_experiencexjb7k.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/fomaralunex/64890458097.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/emglo_air_compressor_ku.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/57441857487.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/80399970419.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/80494152126.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/red_sparrow_book_review_goodreads.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/islas_galapagos_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/97488060255.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/how_to_make_income_statement_from_adjusted_trial_balance.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 4404 bytes
SHA-256: 813222b2cbc9a332260e6c86a3ddbbba5aac092186ece95a172cdcfb57c0045a
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 11572 bytes
SHA-256: 3cdbcefb8efb7bb249390907dfd47b9722403ea4733dc4d26de01d976acf247b
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d
font_03_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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