Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fd39eebc7bd883…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 01:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e183fd798cd3b32d3c5a7ac3a0e0e2c SHA-1: b71ff13959ec7b880535b3bd94f9070ecb4176e1 SHA-256: 92fd39eebc7bd883e42649946ae8d9fdd9eee85b13883f82b331e3d85fb10296
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/wix?keyword=jlab+jbuds+air+sport+manual
    • http://profapp.pro/do_you_add_and_subtract_radicalss1kgl.pdf
    • http://ihsteam.ru/537215682524d0zf.pdf
    • https://tekagilodepini.weebly.com/uploads/1/3/0/8/130813992/saxejekoni.pdf
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/cfe972285c.pdf
    • https://mijagipiked.weebly.com/uploads/1/3/4/5/134524971/boxadatonusapa.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/fezezaximorofamirov.pdf
    • http://vnds-super.space/4g_router_huawei_e5186s_manualpawgw.pdf
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/gemimavad_taridubiw_faditepafosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_839dcbcac6e745cb9809ba00ad1c2e40.pdf?index=true
    • https://s3.amazonaws.com/somisilegex/bozoz.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_d374389f925346d7b4c5d1118bbc40aa.pdf?index=true
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_94726266f7fa49bf802eef93892f6239.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/famous_quotes_from_the_bluest_eye.pdf
    • https://s3.amazonaws.com/batoragubukepo/87379343952.pdf
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_393783478f044cb585bcd35ffe8f1077.pdf?index=true
    • https://s3.amazonaws.com/bomifabipi/6230513882.pdf
    • https://s3.amazonaws.com/polexebuj/21264195835.pdf
    • https://s3.amazonaws.com/sazixipame/windows_defender_10_update.pdf
    • 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_off0000e7c9.bin
507fd9ff19eac6ce0f147ea5dc352172de41329edd19d0c6112d7dcbf2ea95e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 5308 bytes
font_01_sfnt_off0000f9bb.bin
f49bd48cf0368b63bd7413b13613dcb484d87d561a9c03537cb7fd1a1931dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 11432 bytes

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