Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5bf3edf8563fc9…

MALICIOUS

PDF

84.1 KB Created: 2021-03-15 18:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7bfa6b48cb8bfb2494004fd7b716a7d0 SHA-1: 5b93b85966c3a091dee37f3e11b8b7738ad1fd22 SHA-256: fe5bf3edf8563fc961122536a5b201e0eff6c0ae18b273dd218b3e68dc8c6c45
186 Risk Score

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://gimoguvi.ru/strik?utm_term=how+to+set+time+on+cateye+enduro+8 PDF link annotation
    • http://kekebol.iblogger.org/ford_ranger_2021_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/w07gSjb/xonix_watch_wr100m_manual.pdfIn PDF document text
    • http://outputqwvk.space/how_to_remove_descale_on_cuisinartxt6ez.pdfIn PDF document text
    • http://repaircreditscore.info/how_do_i_get_an_ifit_activation_code2qfgw.pdfIn PDF document text
    • http://hytri.com/metifikawi75guf.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/BQ3r0ja/christmas_color_by_number_worksheets_for_kindergarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujabezemaluwe.rf.gd/xopebajazetokegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0d67a8-b0f8-449c-869c-e7a7bbad6782/2287722635.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_7dad0cfe40f14f448eb5ba40b9664b2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef39aee-679c-4255-9d36-174d3618e7a3/1984_reading_questions_part_3_ch_1-2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a272d3-75cc-4339-9c82-c23c8c04f15d/801704528.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_cb8e988848524abb9b32d9a125ee6f41.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_0ac1767a2f6344b68be2bcd644c85aec.pdf?index=trueIn PDF document text
    • http://tonabezagarizom.epizy.com/juzikukoloruvejan.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_b5ce47ddbb714e6594a36dd0070f7b49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fcb20f8-6032-4279-bbf8-b8d71ecba555/27866446487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf96226-4ddf-4025-9c6e-958a9454ea7e/68555600534.pdfIn PDF document text
    • http://zelobiliteriwe.rf.gd/meade_autostar_497_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62402dc-fd3d-4b01-9791-f20d9686b589/zugoxujiguzajubok.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_5bc865128b384df6b34d00e2dbfcd305.pdf?index=trueIn 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_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 5400 bytes
SHA-256: a7b8e49c074661eef27fff6af562d4281c33bce473357fd1243ba0ded1449be5
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 11112 bytes
SHA-256: 081aa51e53b8318d7622bee19ba4b737c2f17df5d360dca7d0651d92e604b2f4