Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf86db50b8d46df…

MALICIOUS

PDF

70.0 KB Created: 2020-11-24 18:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8517e6ce10122ad26a70219038008fec SHA-1: d53d3941442be099d0f2db0a26b5202717a282d4 SHA-256: 9cf86db50b8d46dfc7c5c554b24c51a2a64bd6271a3ee3c65bba3590792332b0
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with heuristics indicating a link farm and a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is weaponized to direct users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=2020+taxable+income+calculator In PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/a1d81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f890ce2e823b.pdfIn PDF document text
    • https://solubowobadiwu.weebly.com/uploads/1/3/4/6/134642134/6391445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5faee2f09b084.pdfIn PDF document text
    • https://telazavax.weebly.com/uploads/1/3/4/7/134729689/982950.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/nokiva/ruzeliziwimus.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/69087320318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8747e28-01f6-4627-b582-981cc7ff5f9b/90053863185.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/nunevevanewotanitorepo.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/fuzoxexepoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/69004915986.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/benilde_application_form_b.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/nespresso_c50_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0461f6e-b230-4390-a2b9-bed35b6a988f/sidemasotozi.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5156 bytes
SHA-256: 315176f1235eaa11666807f1806bc691c2b0d291a58dfef4011707f772953fc3
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 10200 bytes
SHA-256: 28cc033e2d0485c0d7e7ed4540b9e784b95f672f8d30f011b91f0ba455dec51c

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