Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a7fba82d72a4d4…

MALICIOUS

PDF

86.5 KB Created: 2020-11-18 17:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c3e49cca9cd8cf961df02b27786f762 SHA-1: 8394bd9a81e2a6027ec76b542f390f0a5b90d6ce SHA-256: e8a7fba82d72a4d498f694e5bedb32656663dadde7e94b868a06be01e784f58f
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or spam campaign designed to drive traffic to malicious sites. No scripts were extracted, but the presence of many external links indicates a likely attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=probability+multiplication+rule+proof In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8e79366f897.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/7756586.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/bofutenevotamew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5fa37ab96d649.pdfIn PDF document text
    • https://dojarugakafep.weebly.com/uploads/1/3/4/4/134471698/dofajip-xejerizanuk-vifejuxanone.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/be2dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f88271c76eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f9dd5030e742.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7d46d8c6-c4ee-4d8a-bf8c-7be1c3406d42/nopalube.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 5108 bytes
SHA-256: e4ab1becf0265732fc208171606da9aaa4df491f36ab3cc607a7bd6eb6a88556
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 11804 bytes
SHA-256: 4a8f6475104f71b3abf9dd8467d84c55f2dcff16d3a26d88eaae9b3f2e0c9f39
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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