Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac3693a1a4fc43d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 08:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76b4c7ccec4fd7c22b79b350d863edd4 SHA-1: 6eb0bb110da6bf6ed1b2c7c995872ddcf609b76a SHA-256: fac3693a1a4fc43d8ba0ecbecaba24a9cebcfe38a042eec6e2ff16cae461833a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be a link farm designed for SEO manipulation, with a primary redirector at 'fokemale.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=international+journal+of+medical+research+%2526+health+sciences+impact+factor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370561/normal_6041aaf186448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fe1a6532c661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6024f8aac74e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_6050efa65d988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6009db50b4fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_601ddb1ed4d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_6028f04a98ebd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_3e8fdb2a9b1d4a72923910caac81ea50.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_52187c02d5eb4cf1a52ab355223df0a7.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_0cff683a02ad46c8a43ec96f4114aabd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/jenkins_pipeline_artifactory_spec.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/agisoft_metashape_pro.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_d486ce5f90324fa296960d98057ede83.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_0aae4083ae11417f9e7a3270ccdc0cf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/mijixubi.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_6e11fbbd33044c8e9773554893f3f2a4.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_c9e03339aab54050a7f6f00c71a5c60c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/juzedafimixotulusorapop.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/the_bulletproof_diet_book.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_3b4ff4bbf3164527b0a8ad0803763bb2.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_081752ef929e4ff4b86057675c14d782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/fb_messenger_lite_apk_uptodown.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_48af6414b7e940afbcb18d7c1ac16af6.pdf?index=trueIn 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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5276 bytes
SHA-256: 38be5e8f41b9d1ef9505ad42f69e9ecfe7cd03d78b3932345831c09ea8d70a86
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 11292 bytes
SHA-256: cbeadb3918eba10539f468d251817b8cbff12b90472106d8b20abf4ac8907d45

Open this report in the interactive analyzer, or submit your own file for analysis.