Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d3c0b843b5a9d4…

MALICIOUS

PDF

71.7 KB Created: 2020-11-24 04:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e22cf38ce9a33cc91908079d88ff0534 SHA-1: 839b45d0daaa3fcac71a247e19c28a50afc3ce04 SHA-256: f1d3c0b843b5a9d42b597bca35ed4f2fea879463655bdd898b881ccac271ae09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/123?utm_term=forcing+cone+reamer+revolver PDF link annotation
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/5bd230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5fad3b492b725.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/xuvubenegakege_borufubital.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5fb325269a153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebaxa/232-4_cat_code.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/tobesi.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/71026835930.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/tatewukovovo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/1988157171.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/contemporary_business_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/54280060296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417afde9-8c42-46a7-8641-45f58e78660a/coalfield_high_school_website.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/a_star_is_born_soundtrack_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68089f82-3dde-4795-a061-4b77722086f1/hp_laserjet_1300_pcl_5_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 4956 bytes
SHA-256: f6695d2ee9d9ad2f38e7bdace56c882043c93b02728a40e31d68d7b9a84845a5
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10972 bytes
SHA-256: 6673c48b67d032e784fbfff7209684ee7519bc79f8fc44f465bc23038c2fca67

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