Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631a6d058954ed4…

MALICIOUS

PDF

77.1 KB Created: 2021-04-20 06:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1992a4f01f3659ccf7d3a33c00402c8 SHA-1: 1cdb21ba2317865b2ab8f9af239ea6337a649e02 SHA-256: 6631a6d058954ed46a55594e1791664e1d0a50c2ec938a9f24e2d51fb5938663
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 'https://dafemum.ru/strik?utm_term=cycleops+fluid+2+vs+fluid'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cycleops+fluid+2+vs+fluid In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fe51da304c1e.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/alesis_dm10_mkii_studio_kit_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fcfa2a87d53f.pdfIn PDF document text
    • http://life-news.tech/432400865mopek.pdfIn PDF document text
    • http://teachersaid.fun/388739903741zswy.pdfIn PDF document text
    • http://copyrighthelpptteam.com/zirojowalodaboxorakifs5f.pdfIn PDF document text
    • http://fastcreditcheck.info/9078539791060we5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_60220fbf232e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fd79f2e86dec.pdfIn PDF document text
    • http://zanartcc.net/tiwisaregibaxuguleajf5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6011979debe6f.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/wobuzisibal/xibigugovusodowokos.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/why_does_my_hoover_carpet_cleaner_leak_water.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/arya_2_full_movie_movierulz.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/demon_lord_is_a_part_timer_light_novel_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/origami_butterfly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/craftsman_easy_fire_electric_staple_gun_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/digobolavoramal.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/advertisement_worksheet_esl.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/medical_consent_form_template_gdpr.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/siwazakapo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/analise_combinatoria_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/fuperadazajefabitoteb.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/sejodujizegoten.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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5044 bytes
SHA-256: ca67301a04b1b15d54649460cfbf6886d7338fe326befee001b5751eb86df336
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10932 bytes
SHA-256: c65bf5fe9f163f823045caea44e6ea816cf48ed77e3cde5f02aea208146b2026

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