Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fb87f38c866b21…

MALICIOUS

PDF

101.2 KB Created: 2021-03-25 15:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6cb35fa9735b4dfbcc84da49198cdfc7 SHA-1: 531c6fec59feaa140ed6f84f727e0b34d5f682eb SHA-256: d8fb87f38c866b21c508dd969c33b0bf204bdf246f1b777a33a7c5e93a426fed
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL `https://mezovuduw.ru/strik?utm_term=remington+700+tactical+30-06` is the primary indicator of the lure, attempting to entice users with a product name.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=remington+700+tactical+30-06 PDF link annotation
    • http://biweekamnf.com/cyber_security_certifications_to_get09f73.pdfIn PDF document text
    • http://giftcard-sale.store/96045253226dsq1q.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/44848716324.pdfIn PDF document text
    • http://odemebayisitrafik.com/where_to_buy_batteries_for_landline_phones01pzo.pdfIn PDF document text
    • http://streichpack.online/6253078273zkuq0.pdfIn PDF document text
    • http://bostpolamos.site/72829197758ywwem.pdfIn PDF document text
    • http://com-signto5.xyz/tabifopawadumokofowijig5yr8.pdfIn PDF document text
    • http://lianhua.life/964900274932pqk1.pdfIn PDF document text
    • http://garant-ritual.online/kokoro_natsume_soseki_downloadd35xk.pdfIn PDF document text
    • http://girlsbeach.space/48355962684z5wmk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/davojamoxorapajegoke.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/sufujon.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_4a58bb178bf141d8bfef6adec06b093e.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8b141ab1889a421495d9fe2a434b635d.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_591bd38b68b24cfba9dae4cbfd4c3516.pdf?index=trueIn PDF document text
    • http://nitubak.atwebpages.com/zopaw.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/how_to_raise_schwinn_ic4_handlebars.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/tresca_von_mises_difference.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/solution_jeux_sherlock_holmes_the_devils_daughter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 5424 bytes
SHA-256: be4d2812bc1b5c5269bc9108694416a3be9447ad3cacb5a378576e6d6f5749ac
font_01_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 12280 bytes
SHA-256: 0352d6b683f8b16207f79970074672639092a5f089bc7629d180f867525ec02f
font_02_sfnt_off000173d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D5 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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