Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a52cb0588373cb…

MALICIOUS

PDF

97.8 KB Created: 2021-03-23 08:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76330ed1104fa9490fb73ff1778d4ff SHA-1: eff15d3eca0d8e76d68870168aef39c22480927c SHA-256: 14a52cb0588373cb1e7471479cb09bb3f752d4c0322eeb4e83fb387c9a32a23e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mezovuduw.ru/award?keyword=bsf+constable+tradesman+application+form+pdf+2020
    • https://mapilezije.weebly.com/uploads/1/3/5/3/135322213/391278.pdf
    • http://suxoxaxowigab.scienceontheweb.net/estrategias_de_ventas_gratis.pdf
    • https://vojawafi.weebly.com/uploads/1/3/1/6/131636668/mejujaroluxafejarata.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd14975e87a2.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_60015ee778d43.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60178ef9b602c.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_60521216a0f80.pdf
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ff52f63bff9a.pdf
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/6f9698279f.pdf
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/5988926.pdf
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5fe19ff659877.pdf
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5febefee7a51c.pdf
    • https://cdn-cms.f-static.net/uploads/4450513/normal_60253f54e3c71.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/43710991760.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5fda66bb579b1.pdf
    • https://cdn-cms.f-static.net/uploads/4371536/normal_605046374bb47.pdf
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/fawejejewaxi_wodubuvakusad_vemipebage_xokabojebaw.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_6054c969cc71a.pdf
    • https://cdn-cms.f-static.net/uploads/4426828/normal_60248c1d78b79.pdf
    • https://cdn-cms.f-static.net/uploads/4375206/normal_60571de0c0aca.pdf
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fc87eea8772c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_e3ba780aab1146f89a184d13e1c76336.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_51304225f8f84af8bbcd65c250c20db9.pdf?index=true
    • http://kisalonokexiwi.atwebpages.com/47529086189.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd4.bin
1dec70ed291db91b26731ac3421fb5eacc66bbbdf4c757f328c981e8b0158703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 5764 bytes
font_01_sfnt_off0001205b.bin
91efb613eb3cc768ed1b844395a0c53fbb8be0380b0ff2b4eaf2a5816080689d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 11564 bytes
font_02_sfnt_off00014805.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 16096 bytes
font_03_sfnt_off00015d0a.bin
ed068d86d0dedb17ecb4b0c1899bfb6b7b475fa21341bb1917aaa642869c1a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0A 8128 bytes

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