Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e52f64933890be2…

MALICIOUS

PDF

80.9 KB Created: 2021-06-04 19:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 33b7b1102cb0e79b581b1ef3424ffd52 SHA-1: 15f334f9ea5b15a03a302d3f37266031d4503e21 SHA-256: 6e52f64933890be28f232894d01b12d260469ff47f859f130c3cf3dfc571f1ef
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, including a link farm and an SEO redirector, suggests an attempt to direct users to malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://medvor.ru/pbw?utm_term=react+bootstrap+ecommerce+template+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5ff0ce9f38950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_602dda7551a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6019bd0c5ad6b.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/fujasawitokoborij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fc9beac5f198.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/5697614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6023653b13776.pdfIn PDF document text
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/rogitebakavavoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff0334a5bd55.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/5099536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_60498e5bc4fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fd0604831498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_604a80649183b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_6008c9f02be4d.pdfIn PDF document text
    • https://fobabugukejapa.weebly.com/uploads/1/3/4/5/134576868/tenupetumajupisibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5ff4ecf76231c.pdfIn PDF document text
    • https://pebusopewege.weebly.com/uploads/1/3/4/7/134752512/8d59263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_60561076d3bdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5fceb6b2b558a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6067be0651608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470985/transistor_configuration_download.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144524013/tunixexitejidumakeso.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144425370/does_total_fitness_do_nhs_discount.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/kesolaxozol.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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 5308 bytes
SHA-256: fab128466b5fa4ec37dddac9d550efeb330ec06987c02426383915f6ea41efdf
font_01_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 10616 bytes
SHA-256: b9027020322263f5f2db6c695fe7c98772c83830640a36c91cca2182d1620304