Malicious PDF — malware analysis report

Static analysis result for SHA-256 6582bf440a121f53…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 20:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92375ecab229039748f84b68b9016221 SHA-1: 104ed27639b67d53c03140a91f8ca070a79361ab SHA-256: 6582bf440a121f53d448aaca4eadeb9c879f06d5c7687ca2b08bf240c19866be
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://yafferge.ru/wix?keyword=five+basic+rules+of+track+and+field'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=five+basic+rules+of+track+and+field In PDF document text
    • https://cdn.sqhk.co/lupobikud/qgjRbia/snake_puzzle_cube.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/sM0ggvb/bowotodasebebola.pdfIn PDF document text
    • http://geosen.net/90078263890vo77d.pdfIn PDF document text
    • https://cdn.sqhk.co/wubumeze/gjShjhe/40617809413.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/q_se_significa_uniforme.pdfIn PDF document text
    • http://getsalle.xyz/a_cuantos_centimetros_equivale_1_metrom064q.pdfIn PDF document text
    • https://cdn.sqhk.co/nidebuwe/geNhbjb/lixelilebikesivove.pdfIn PDF document text
    • http://mejagudabukode.iblogger.org/wagujeje.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/gogunabones/sexugovulafubonejabepomif.pdfIn PDF document text
    • http://dokaginiw.epizy.com/pekewifidafex.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/miginisozibilekupaseka.pdfIn PDF document text
    • http://vulofuza.epizy.com/ansi_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/widofamomup.pdfIn PDF document text
    • http://nosorozu.epizy.com/elementary_statistics_a_step_by_step_approach_9th_edition.pdfIn PDF document text
    • http://subumopu.rf.gd/game_android_apk_data_obb_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/calendrier_biodynamique_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/arjun_reddy_hd_movierulz.pdfIn PDF document text
    • http://tatifamajerub.epizy.com/best_reader_for_apple_ipad.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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5236 bytes
SHA-256: ad19bcc01351fe0b7e79bf9bf32d810c3d5f6519277bf4fa46a9fed680160c2d
font_01_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 9940 bytes
SHA-256: 57bbb0741a7fcfa9e3961ed98845178d3b366bdb5bb2e23d3f63e11d689557a5

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