Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b9e7557c7caa30…

MALICIOUS

PDF

105.5 KB Created: 2021-03-25 00:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2def04dc4afb39879b3dee80470276f3 SHA-1: b2eb9cabf39c6a0298aeb5168407f8b71ac9e2dd SHA-256: 12b9e7557c7caa303aac3c07de4031fb0be7a8afe340f2026950b1a984403c2f
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 0.9997

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://pelibifir.ru/strik?utm_term=beethoven+sonata+op+109+analysis PDF link annotation
    • https://cdn.sqhk.co/bajowekununa/TjcEXih/50059195515.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/oHFiji1/pencilmation_new_episodes_2020.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/kelugudezosotakije.pdfIn PDF document text
    • https://xaredeni.weebly.com/uploads/1/3/1/8/131871979/gotuzibolajuli-gubajo.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/memisijivis.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/ghajeNz/sigusuvawumotisimim.pdfIn PDF document text
    • http://bunewasebawaxig.iblogger.org/final_fantasy_7_remake_xbox_release_date.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/9741936.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/8830c8b7-e79a-4331-86ae-75d894180486/47613984269.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/3d_abstract_butterfly_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/75165133703.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bmc_full_form_in_dairy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803f76bf-57d4-47af-9843-7f3997950bd2/kusugemamagujememobago.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/blender_app_apk.pdfIn PDF document text
    • http://gejaran.epizy.com/vidulejusefofidef.pdfIn PDF document text
    • http://nubuxaza.rf.gd/bejaweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9474534-ebf1-4817-86e0-ee2529fb0f84/80152169732.pdfIn PDF document text
    • http://putetudufotu.rf.gd/algorithmique_1_exercices_corrigs.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/4390691686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e8615b-8710-4e18-96c4-185e76a90e49/magic_chef_10.1_cu._ft._top_freezer_refrigerator_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e089dc-2a68-4c45-ad5d-7d113b0c0751/zozamegiwad.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_off0001604c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604C 5372 bytes
SHA-256: c00e30c1cc244fb4ccdb4578221b046482ef612a149b116623366891591289ab
font_01_sfnt_off000172a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A4 11348 bytes
SHA-256: 46b5810fa0d37d07613994b202b773baccc700df8e50b11f360ba137585d7e8e

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