Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f714a3d87ccd801…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 05:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f0ab06f82e32c7c564fea94aab51ea4 SHA-1: 41b05c1280bb5ba07524034d55f97e210082a2c9 SHA-256: 8f714a3d87ccd801ad1f47f6df374d1366570f45b1eec2eef7dc2b03d906f6d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'soxebez.ru', which is flagged as a potential phishing or SEO spam lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/aws?utm_term=stock+trading+guide+for+beginners
    • https://cdn-cms.f-static.net/uploads/4479224/normal_604187e5821fe.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_5fd34b827c2e3.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_602c074c86b78.pdf
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fd9288b9365e.pdf
    • https://cdn-cms.f-static.net/uploads/4465538/normal_5fe73fc82cb64.pdf
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe4625bdaf31.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60436e1f2dd6c.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_6030774c17b3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_8d70aa3ca4e04dfa98e20a9918a7df25.pdf?index=true
    • https://s3.amazonaws.com/panalipolifod/english_grammar_book_class_9_download.pdf
    • https://s3.amazonaws.com/wiwamoxamo/wonder_movie_in_tamilrockers.pdf
    • https://s3.amazonaws.com/pilazi/lagu_ost_ajari_aku_islam.pdf
    • https://s3.amazonaws.com/memexelu/treasury_department_currency_manipulation_report.pdf
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_ecbf977898ae4efb9ef4693df00f58e9.pdf?index=true
    • https://s3.amazonaws.com/geradi/glucosamine_chondroitin_msm_liquid_form.pdf
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_1d9ecdb986734692bbd26b9ca28b7dbc.pdf?index=true
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_7ce8cff5d2394a159224a2843a22543b.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/affidavit_of_parental_advice_for_marriage_form.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_73ad4d8bd7e74c07bf799280108f5700.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd40.bin
aab9ceec6a3946de6469430feb4b1f99785b6159cd1ce96c050df3b12a804733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 5464 bytes
font_01_sfnt_off00010fe8.bin
a024fc70b35e2271081e87fab7acec6d950105e37908d91f5e80ba359eb648a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 11132 bytes

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