Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19ee8e3a7b0a51…

MALICIOUS

PDF

75.3 KB Created: 2021-03-05 13:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c074b20b8a2758e09b16105268c5f4ed SHA-1: e11207f0832b6581f92dbb79d4c06f17a0728331 SHA-256: 8a19ee8e3a7b0a51eaaceb3145bba83237fe80c3edb227d7b9461d48ed0dd2f2
156 Risk Score

Malware Insights

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

The PDF contains a link farm and an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to contain keywords related to medical information to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=what+size+needles+are+used+for+insulin
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fd79ffe7f6eb.pdf
    • http://zitarekatinupas.sportsontheweb.net/rudoxozanezugitonuki.pdf
    • http://siwupojotuj.getenjoyment.net/3031271848.pdf
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fe95beb3571d.pdf
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/4753948.pdf
    • https://static.s123-cdn-static.com/uploads/4369143/normal_600562a04e65f.pdf
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/fb01fa.pdf
    • http://bivaxosufuxibo.mygamesonline.org/ladorisojaj.pdf
    • https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/dejevovujazitedomo.pdf
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/tufegekap-wekekozalo-moturaris.pdf
    • https://static.s123-cdn-static.com/uploads/4380228/normal_5fe2668e8de1a.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601d0a0daedd8.pdf
    • https://static.s123-cdn-static.com/uploads/4415935/normal_5ff0e486ebd01.pdf
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd7a6364eeb3.pdf
    • https://vufuredupe.weebly.com/uploads/1/3/0/7/130776381/lemujidewol.pdf
    • https://cdn-cms.f-static.net/uploads/4405179/normal_601dca242aa69.pdf
    • https://cdn-cms.f-static.net/uploads/4471710/normal_6027def38230c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_c2a9ad1f22a34aa98c05113a76ef33e6.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_095d30d5aa21448599ed34cc8f257cad.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_0ad5b4b1b294400686e695467ccf2809.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_3cde2553ca2a4c8daa2a0e10cfe47197.pdf?index=true
    • http://vidugozu.atwebpages.com/84135977482.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_fc01d724921340cdafa99cf242cf7534.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_off0000eadd.bin
ba0bbacc0c2958b4fffde524c8c9573b55455a078f109e3c2603f6b4ad78ea6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5060 bytes
font_01_sfnt_off0000fc1e.bin
519b92820138f073743531da6f90d226fff19598cef5ad80f1565d641ea23ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10236 bytes

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