Malicious PDF — malware analysis report

Static analysis result for SHA-256 3082081a8f600f1d…

MALICIOUS

PDF

81.2 KB Created: 2021-06-10 18:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01ef1f5b13aa513b91529ea512474fc7 SHA-1: e27a08cfb45a3f27f9c82af9d08c871de22afd5e SHA-256: 3082081a8f600f1d7694fcbb7cd1c9c7ded4b74efea4b44a24d6b8e391debed8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to 'druttle.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to reference 'Bcbs of florida clinical appeal form', indicating a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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/123?utm_term=bcbs+of+florida+clinical+appeal+form PDF link annotation
    • https://kedepojab.weebly.com/uploads/1/3/0/7/130739947/27f3400ac.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/bbc12d3a8b0b.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/puvup-votiralofapupul-pelogemipe.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/8109791.pdfIn PDF document text
    • https://sojinunanujiwok.weebly.com/uploads/1/3/5/3/135311630/277e2.pdfIn PDF document text
    • https://fuxexuwamonem.weebly.com/uploads/1/3/5/3/135387882/68107.pdfIn PDF document text
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/4d062f3bcca6.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/fezebibazuni-nuxobun.pdfIn PDF document text
    • https://wirujiko.weebly.com/uploads/1/3/4/9/134900452/kabalajonexinev-wixevumoboz-busefazixugiwi.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/3b333444a77e990.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/vavabosuropib-sinamon-runudem-zobilirazi.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/puxomedexixowogez.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/2183998.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/ritizetekenetobur.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/4312432.pdfIn PDF document text
    • https://daxejinuvu.weebly.com/uploads/1/3/4/6/134645798/6432231.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/d3e558cff86e.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/fbc3833cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae1b07a-f26c-420d-8bd8-88c989101c83/nefobufuzovikajifazejiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0c809f-fd3d-4c7b-b9a8-b1bd4004e2cf/22839713544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7659aa1a-3b91-4ad7-8bda-6f809612d7b4/how_to_put_whirlpool_washer_into_diagnostic_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc34d9f2-6cef-4500-ba33-9e087ef298c6/how_much_does_it_cost_to_start_young_living_essential_oils.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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 5492 bytes
SHA-256: 2afb69d963a7401aed8c117b3fe932f506a32fd3a215d57edc23c975e7c0016a
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 11436 bytes
SHA-256: df70ad7e0155426b7d1922832121ef0eee839a83d8487560d363f61ab51ab429