Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a108ba439618065…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 04:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eae4e641020c9c9ed39215cb6760faa4 SHA-1: ed8240f7ad0d898239f6f869147737d30a95cdc4 SHA-256: 6a108ba43961806500356292a3f11b39437c0956bc9af3053dad51b42bf00c41
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The embedded URLs suggest the document is used as a lure to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://ponafet.ru/award?keyword=all+of+me+piano+accompaniment+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/gederanew/Zm0tibH/jezotiwakolanekugovuke.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/geiauyX/28224710519.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/ge_front_load_washer_codes_manualt5zn6.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/hc9jeO3/super_mystery_dungeon_cave_of_the_deep.pdfIn PDF document text
    • http://mif-smeh.space/17057623477mqqvf.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/BgiPgcu/antivirus_android_gratis_el_mejor.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/icZcmM9/degokojiwemofetirofusa.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/compelling_conversations_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/hR8hnNM/luninenoselisejat.pdfIn PDF document text
    • http://tublitalia.fun/kobalt_table_saw_accessoriesjzcbu.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/xzOid4t/world_soccer_stars.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/xadopuwaleba.pdfIn PDF document text
    • http://khanapoorti.com/bekaborepalebv6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/3jjhf8W/98837770003.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/b0hf2gj/drunkn_bar_fight_vr_ps4_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_aeb4ed3da7e54e4a81d7548c8e914deb.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_be8b0846222d459a9b94ec3b3e4f4d80.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_a5135fb35412484fa54d4df178451d46.pdf?index=trueIn PDF document text
    • http://pajupevezujugut.atwebpages.com/polk_audio_magnifi_mini_app.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_4f5f7e202d294cda815abee96fdf25fe.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_e58a82a7e16549b29d037f2a78dae4cd.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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5288 bytes
SHA-256: b35adb9f4bdb56a6440f9f94111934a400e17027a7dcfd4302ec8f3f67499983
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 10748 bytes
SHA-256: 5a6296d0713ccec8dba096138d5e0ba3145be61a01d9ac8130b121bfdc7756bc