Malicious PDF — malware analysis report

Static analysis result for SHA-256 9444303f0667e239…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 02:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c06425849d81c404dad172c7d03a1490 SHA-1: 8ce9077cb839fb21445c8c68ba666f1c716ecbd3 SHA-256: 9444303f0667e239ec84cb8e3aa21cb982ed048ef878346a1377cb45e3738a2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to S3 buckets and other domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=to+james+by+frank+horne PDF link annotation
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/7932285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379614/normal_5fdd0f804a736.pdfIn PDF document text
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/04178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5ffcd21e3dd67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370057/normal_600595b75ae3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5ff2885a416e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_602fc750eb10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_6011073509b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_601f1ab9e401c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fe526c978b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_6027b4ec0d829.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/voxipanovigepiv/musamaguzifinanezibi.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/gidis.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/puzafidexidudadefelofupek.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/37483306810.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/criminal_justice_reform_bill_2018_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/55947131260.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 5308 bytes
SHA-256: fcfff00147ad7b3b2c40f6d70193913ba10fe53aed259d7d6c2242ae7b83fa1e
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 9956 bytes
SHA-256: cfe5c2520fe288923defa92079ea9fb50f48b96de40fee26f43b07bce8352043

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