Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb87db23d484139b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-26 07:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6cb1a3788ae212d575e431650d59052f SHA-1: 8d8deee05207ab171f925972723c646167f5c1e8 SHA-256: cb87db23d484139b47173ea5e76d7f7fc8b3dff5e2c1be460b1a624c963e3a28
186 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 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://maypoin.ru/123?utm_term=undescended+testis+treatment+guidelines PDF link annotation
    • https://cdn.sqhk.co/tufiroxova/fqcgeii/capstone_definition_urban_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_601578f4182bb.pdfIn PDF document text
    • https://cdn.sqhk.co/zadirajuviku/hdjjO8n/iphone_mp3_ringtone_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ffcd03a66d31.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/jekofaziwa.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/484860305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_82d0a91871d34b4394241d848f9832e1.pdf?index=trueIn PDF document text
    • http://janosunitemixe.epizy.com/rapogob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0672806b-cdf2-400f-b1eb-902290b2f632/ravuxesilosox.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_15cf4be60b8248c6870a0a2ecaf2a87c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9604205-0c9b-4c08-858f-57d0535821fe/what_documents_needed_for_license_renewal.pdfIn PDF document text
    • http://wesukudepabu.epizy.com/adobe_reader_free_download_for_windows_xp_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfeb45c-a74f-4807-844c-e2191f3eb853/67878298138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa788f0-af4c-4ebd-9366-1d6c0c5a6b81/10229037541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbe8a2f-6618-4b39-b868-aba4677b3e6f/teach_students_how_to_learn_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b323fed-7901-46e9-8773-6799baccc7ad/college_comparison_spreadsheet_excel.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_147797a8018c4c9393f8e10500631e2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fe6504-7ccf-4598-8b01-337a9138719e/walgreens_infrared_instant_ear_digital_thermometer_instructions.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_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 5252 bytes
SHA-256: f7cb16d7c2cfac94006596acc63e15a1bc4b7fb09100a5aa293e728f9f545aef
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10832 bytes
SHA-256: 1e6315528aaaa9e132367d42a35bbe3a4cda277ebfbe6b72b5821c551d481f2e

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