Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46ab18e66d90be3…

MALICIOUS

PDF

93.5 KB Created: 2021-05-04 20:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b77caeecd0050fc7c86769c8ca5c816 SHA-1: 712a8646362313894e140cce244632f508c24d4d SHA-256: a46ab18e66d90be3c04a21b73603f08da9088d3f19165c3924efd82462d51449
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain 'botokaw.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan PDF. The presence of embedded URLs and a link farm heuristic suggests the primary goal is to redirect users to malicious content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=battery+tender+jr+operating+instructions
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/5461629.pdf
    • http://shishkin-seed.xyz/cucu_photo_studio_kelapa_gadingbzr09.pdf
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/8780821.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/wenutumamiwepow_bupuzibabofiwe.pdf
    • http://bit7.top/912609861815ipca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jajoxulabojaso/zotezupebepam.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9c7ddfd98ce24a44aaaec00a027363a1.pdf?index=true
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_0fa7d30e5f39490e84b0754bd104685c.pdf?index=true
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_3c5684cf4d8d47deb4315f9a8f40c723.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_6d757240db8d490a9077058e4e7d0b5f.pdf?index=true
    • https://s3.amazonaws.com/woneketelak/piper_aircraft_parts_manual.pdf
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_808374a9dca54bb1affb22aa41db466e.pdf?index=true
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_e27faccf0d334ee48ffbc96cdcf5a066.pdf?index=true
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_bb17b50aee6044309eba2dbafb1204f4.pdf?index=true
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_bad402ad0338420182526888ad8d8a67.pdf?index=true
    • https://s3.amazonaws.com/dabatisew/devise_custom_mailer_template.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_957e1d5a6b294deaa2ad96720df67b7c.pdf?index=true
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_7e337e14860e42b2a7713f8aeac6086a.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_off00012de3.bin
a93d64eea6477d50f5e03744ceaaa2baa568de132b35a4b108abee96d2694b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 5436 bytes
font_01_sfnt_off00014081.bin
1f95b0d2b3ed6ee5b7cd4a5bdad1ddc83401355e855091bf9ec06c0cff13ce49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 12108 bytes

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