Malicious PDF — malware analysis report

Static analysis result for SHA-256 273d466d13eba087…

MALICIOUS

PDF

70.7 KB Created: 2021-02-12 21:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fa8b6dac27265985b61ca639890f9bf2 SHA-1: 304c327c777cf3243de74256fd378581f935681a SHA-256: 273d466d13eba08701dbe06f4c154023b2605c67667ff7b640575caabd67b426
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as 'https://baarspo.ru/123?utm_term=change+of+base+formula+to+evaluate+log', are likely used to redirect users to malicious sites or download further payloads.

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://baarspo.ru/123?utm_term=change+of+base+formula+to+evaluate+log PDF link annotation
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/ebd6776590.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/cxjchcS/madeposopituxutefezowokos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_6004896bb8584.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/jajdugd/75068668288.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/mudanejofinizesujoz.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/rimopujuranotowude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_601705f79a64e.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/huiigdt/wolo_godfather_musical_air_horns.pdfIn PDF document text
    • http://majubavilusuda.iblogger.org/border_officer_ios.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/wizukani.pdfIn PDF document text
    • http://zexawil.22web.org/kifuxujonuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/Ke7KQhj/does_hitman_reborn_have_english_dub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizizototumat.rf.gd/guided_reading_chapter_books_4th_grade.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/consumer_reports_car_seats.pdfIn PDF document text
    • http://kapilijugewi.rf.gd/lafijet.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 5284 bytes
SHA-256: 9297128650b9314315a7b7cc0cf77686be9297834fa7bfd2d807e29c39ea24cd
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 10672 bytes
SHA-256: 924a25ccfae769a64ed9e42321adcefc7a6754480d20d96fb2a47f2f5e6b80c2

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