Malicious PDF — malware analysis report

Static analysis result for SHA-256 6199b34dce1d21e3…

MALICIOUS

PDF

72.7 KB Created: 2021-02-24 10:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 365a334b8ebdb7cb814c3bf8817b4e00 SHA-1: d0f442801397afd65aa522657fae5f0cb8fdc442 SHA-256: 6199b34dce1d21e32847107e26b7db97cba3373af03513527b63d42a7f50fbba
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=basic+guitar+lessons+pdf+free+download`. This URL is presented as a download link for guitar lessons, a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL strongly suggests the document is designed to lead the user to download further malware.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=basic+guitar+lessons+pdf+free+download In PDF document text
    • http://duplicwcnj.space/2019_jeep_cherokee_owners_manualkemei.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/yGgciiv/download_mp3_music_online_for_free_mp3box.pdfIn PDF document text
    • http://ca-management.website/52152910779unkn1.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/6rpigjc/rush_roll_the_bones_album_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hggjf6Q/66944470001.pdfIn PDF document text
    • http://meetchambre.xyz/11208274140zs15v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602254ed753db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fdad13f8fd98.pdfIn PDF document text
    • http://in-step.shop/kerala_university_msc_zoology_syllabus87rlb.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/pevarijidasalop/wosikilironam.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/nuxegupavibojira.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/mumejogetenud.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/platinum_physical_science_grade_11.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/algebraic_topology_spanier.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/job_order_cost_sheet_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/debridement_procedure_note_template.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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 5464 bytes
SHA-256: 50f7a89c9256ed558af5b27d4727f0bb8ec237e10a39fc609c5df8393c1dc7e6
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10536 bytes
SHA-256: 72fdc969a88c0df9c82c38510cd6dd6b8a6ee3277e774c26b1ab720c8dbd066d

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