Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb01a9711abf7c0…

MALICIOUS

PDF

66.0 KB Created: 2021-02-12 07:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 310122354e539d4e069a8fa472e89ac6 SHA-1: fcd823f7ebccd7037f70b8994026ee4637c1ff57 SHA-256: bcb01a9711abf7c055505e1dcb86bfcaa17b8d57c80aad5b31318f0c3b26ea92
154 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link to a known malicious redirector, https://crophysi.ru/123?utm_term=louet+spinning+wheel+s15, which likely leads to further malicious content or downloads. The document body, though heavily obfuscated, contains text that appears to be a product listing, suggesting a lure for phishing.

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://crophysi.ru/123?utm_term=louet+spinning+wheel+s15 In PDF document text
    • http://suxiselukex.66ghz.com/lomuvadoved.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5feb4f998c602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_6025eb9bbe713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe778c6f2774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_600bc39e5379a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5fe50bab0e9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fd820694c514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6024b81160752.pdfIn PDF document text
    • http://hisgohar.site/taterizulopedakezizass8rk3.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/risisipajole/zebotifen.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/comparison_of_adjectives_worksheet_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/tamilrockers_tamil_movies_free_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/93952665183.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_off0000c3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 4984 bytes
SHA-256: a3efba5dc3f984e01b2fe03d168f208aec4be48a201c1ecc6dd2d8f3b137804c
font_01_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 11412 bytes
SHA-256: 0b9e9c2f4c9353959f53014499688f084dd1c2d6210c4eae8bb94804f8c56443

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