Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7efdb39af4a553e…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 17:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b6eec371d28c10dbd56111354550b1a SHA-1: b0e1e152b0536a58742c1deab26f515efed2874f SHA-256: b7efdb39af4a553e0d00440a24bbc681e0a2d14a7498b845fd50264e463413da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam campaign. The embedded URLs and the heuristic firings strongly suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=how+to+connect+rocketfish+banana+plugs PDF link annotation
    • https://cdn.sqhk.co/janonaset/fKFglja/vutagikibedib.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/110ba57.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/9186518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_6056e77659656.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/xotebuwanasujam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5fd28813e26e3.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/543dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_600391063648a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fd665efe3043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601baac9b7380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_602d0c658df0a.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/ihaii3L/xafiwugetumewexe.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/is_being_flushed_a_sign_of_labour.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/agjiaeG/sales_receipt_book_office_depot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_60463f518ecef.pdfIn PDF document text
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/fidumonuvasiwowo.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/biwokeragef_pakibirowowikal_volirimopome_volina.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jfhbfia/pagitupa.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/fizup/52538584897.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/cisco_commands_vs_juniper.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_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 5536 bytes
SHA-256: 0d527588099fc4bcf09f11b69b9f51b61069678533092e9807d4d466b6330839
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 12076 bytes
SHA-256: af78bfea38917580102a3887b6732c0187ebaedc3205d5bdcc47afb0765defdf

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