Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc90688c54fd8af9…

MALICIOUS

PDF

68.8 KB Created: 2020-11-23 16:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: becd059a3e3919d139137a0f759e3f14 SHA-1: d1f38b1ceb95eb21371c988656cadda9299f2fc0 SHA-256: bc90688c54fd8af93a6c16dcf91031c60e83ec5a3663c555a559226f529051c9
222 Risk Score

Malware Insights

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

This PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain a lure related to 'Spiderman comics download' and urgency language, suggesting a phishing or scam attempt. The presence of multiple external PDF links, some pointing to S3 buckets, indicates a link farm or content distribution strategy, likely to host further malicious content or obscure the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?utm_term=spiderman+comics+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f9000f63bdba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_5fa195d9c5b49.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/c5a44174b.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/zeworibuzoza/40274541296.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/banaf.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/bhojpuri_video_song_new_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/15400-plm-a02_honda_fit.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/12339175306.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/60339449407.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/walonadese.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gangstar_vegas_4_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc191f5-bd2e-45b4-bac2-d4bb0c810d8c/phet_simulation_energy_skate_park_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/44266047687.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/enthalpy_stoichiometry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/mizuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/gopro_hero_5_session_instruction_manual.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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 5412 bytes
SHA-256: 72380b68d360529b3a354242c51b7b97e36a745eb2bc8b28f2248d12799847e4
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 11280 bytes
SHA-256: a43a878224a2e0604c4f6c405cc73bbe789e6847c26a03aef830239cf0bedc00

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