Malicious PDF — malware analysis report

Static analysis result for SHA-256 3905edfb5822837e…

MALICIOUS

PDF

74.4 KB Created: 2021-05-07 22:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f24ee72e60ef8a4421efb36e4bc13363 SHA-1: 12318c35197c788eaf3234b3febc8789d5cfa021 SHA-256: 3905edfb5822837e9c93cc36efef10e8f2b9ca3e0f71fe279f166cd15ddda968
166 Risk Score

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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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=asus+m5a97+r2.0+bios+update PDF link annotation
    • http://com-login8.xyz/88234320843k8rkx.pdfIn PDF document text
    • http://artdebug.site/power_audio_pro_music_player_apkpurehg6ut.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/25747366536.pdfIn PDF document text
    • http://winfreeiphone.xyz/gopesosowfqhp.pdfIn PDF document text
    • http://nukels.xyz/learn_python_for_data_analysis_freexpd6g.pdfIn PDF document text
    • http://xxlmature.site/wekapiuvzur.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/zofuluzigasoku.pdfIn PDF document text
    • http://vk-settings-change.online/640007418901z98m.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/infarction_pathology.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/lord_of_the_flies_book_review_amazon.pdfIn PDF document text
    • http://salet.store/tudavamekiblz095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwitus.epizy.com/apache_poi_scratchpad_jar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b544687a-49cf-416e-8206-ab99b27b232d/kusuxogagesigofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85dcefc-c77e-49d8-8a0e-d030197f8508/music_notes_names_and_beats.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/imam_bukhari_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f785a94c-d3e8-4e2e-b955-9e3a80c4f2db/rita_mulcahy_pmp_exam_prep_9th.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/agenda_2020_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f23e50-d591-4969-aada-23fb9bcd8c18/pre_calculus_12_textbook_pearson.pdfIn PDF document text
    • http://jiwodasovizo.rf.gd/tinkle_magazine_free.pdfIn PDF document text
    • http://kopolug.myartsonline.com/durusopafumenema.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/audacity_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f89109-6a37-45eb-8fec-a3d0499864f8/puxuwok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 5868 bytes
SHA-256: 4554e2c6d65a493d41029fd5474619936532cc3257df41c29be2936c7a15283d
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10940 bytes
SHA-256: 05f749d3d9222f490150105e5cc2881bd99816b80ad701c04e780306ea67f3bc