Malicious PDF — malware analysis report

Static analysis result for SHA-256 daff4e6e624e6b78…

MALICIOUS

PDF

71.8 KB Created: 2021-03-07 20:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 147998dfac0e14cd3f93cf6f0bdd6fe1 SHA-1: 0da9a88c9e0281681e62072f24e70ea992eda142 SHA-256: daff4e6e624e6b78ebab99202b1211bcaabf55e42261874eae4cdcd35b94e907
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dugedepap.ru/strik?utm_term=no+fear+shakespeare+othello+act+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477164/normal_6009278360ef1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5fcee7de9bb09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_60076eb8d2292.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/zerejibixupav/pan_africanism_definition.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_6f505a3049c44d0fb48748408ff6c484.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefipa/four_functions_of_supervision_in_social_work.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/guru_al_qaeda_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/difiburanuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ef039b-d0ab-4f2f-8962-612f44211455/piwikap.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/come_dine_with_me_uk_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/ll_bean_flannel_sheets_clearance.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/voxugemiputamupesiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/sobekut.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_d68f63c6a28e42b7973dc91eca92f39a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/salazalegob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa388b1-267a-4243-9481-293749b52174/what_is_the_newest_wii_game_system.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_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 5300 bytes
SHA-256: 7840b32f26926b2190f0f662bacd567d000c2848ea44e45746fe356564696293
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 9772 bytes
SHA-256: f335ed428f7c5ac4da38d059ad937f2e4b7b3fe72a524c35ded2ac8065cde486

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