Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4bb6d6f7493e3…

MALICIOUS

PDF

75.6 KB Created: 2021-03-26 07:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 213704a2a2439bd743d3cbf958ceb2ae SHA-1: d7116ac6baeb0a00468f43592446ee9c96115566 SHA-256: b9b4bb6d6f7493e36111fd3c98b0bfe0bae001891ee2ae5061402e1c8ad90a5a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=types+of+rainforest PDF link annotation
    • http://mulawejotili.iblogger.org/marketing_communication_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458148/normal_5ff1f32e942da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_6044d858e7244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_603e552f896b4.pdfIn PDF document text
    • https://duwelivupegated.weebly.com/uploads/1/3/4/7/134711348/satodoveguvuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_600c7fa015c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5fe7addfc7d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fda5e24eee5f.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/vozikokub.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/44fc849164f6a2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fcbf76e2a065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5fe41ed3e4a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_5fe83ae796ed7.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/9dff9cfd3d4b46.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/acda01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd67899b8e87.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/gupojakami/tizutedepejawogadituxu.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/where_can_i_fix_my_computer_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/1799565897.pdfIn PDF document text
    • http://fetelezazojidi.rf.gd/dotovosafebim.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/40953874549.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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 4916 bytes
SHA-256: 6a911addc53744e5fe1bffb35ae75fd0df57c399dfa871b10cb6e476d10c43f6
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10360 bytes
SHA-256: 2dcd9207201ab48563f68fc9cebf19f1cfc94cb8512882e44f408c3691519d99

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