Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e914e02c42f5a0…

MALICIOUS

PDF

75.7 KB Created: 2021-05-14 02:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9bcc90a09c4695950b7814e75bbed349 SHA-1: d84b03ae95a75a7faedfc7f0cc1a5fda7eb59a3b SHA-256: f8e914e02c42f5a0bab64dc34ba476ed33fd83a40a9268fda01407a0ba689fa9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=how+to+treat+cat+bite+puncture+wound PDF link annotation
    • https://cdn.sqhk.co/subetudagoli/WZngijf/how_to_iron_polyester_suit_pants.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/how_to_clean_shark_lift_away_deluxe_vacuum.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/ijon3gd/billie_eilish_real_birth_name.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/jbsD0jh/54657458910.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/1iahbj1/14113314930.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/eDSjjjg/great_british_coin_hunt_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/1gdjhhi/improve_word_jumble_game_python.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/1ef5f0ea-286d-4bb6-93c3-5329b2d60f66/how_to_do_a_hundreds_chart_puzzle.pdfIn PDF document text
    • http://likadekax.rf.gd/musica_clasica_para_guitarra_electrica.pdfIn PDF document text
    • http://fiwusinuba.rf.gd/free_securecrt_for_mac_os_x.pdfIn PDF document text
    • http://vofogidazok.epizy.com/asma_ul_husna_malayalam_meaning.pdfIn PDF document text
    • http://detuzepa.rf.gd/rogenekuzal.pdfIn PDF document text
    • http://xoxekojut.onlinewebshop.net/bodyboss_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b35c274-3461-487a-b72b-0598d468874f/how_to_restring_a_stihl_fs90r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc89959-f049-4add-ad3d-87ea58a8e0c6/81430670389.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_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 5048 bytes
SHA-256: b2bed91bb83ae025722a330a7fd8637ececeaabd05781efb9e65446842c8cbc5
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 11016 bytes
SHA-256: 2fccebff2d86e22abc22e022ff3bde0078277f2bc59490a517256f52b4501380

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