Malicious PDF — malware analysis report

Static analysis result for SHA-256 7353904bd8fa61c4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 17:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 433406cadda9bbc691feb4de31e913aa SHA-1: 9d3aeb105dfdf6d179fa47cf5fda7b8d7f2c133e SHA-256: 7353904bd8fa61c4c75d08593b28ddbbc6f4c0c6900b3c57c5a61a8414630aa6
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 0.9996

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://vilenefex.ru/strik?utm_term=does+the+total+gym+help+you+lose+weight PDF link annotation
    • https://cdn.sqhk.co/gugivusofed/hiicgce/65629445676.pdfIn PDF document text
    • https://tiketarutuluvo.weebly.com/uploads/1/3/4/0/134042831/wojex.pdfIn PDF document text
    • http://lavka-karamel.ru/the_fall_2013_full_movie_2020ifo54.pdfIn PDF document text
    • http://nextauto02.ru/nofajazamuvuxumorebifix7z4lr.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gKbOJjv/46617912987.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/hhAeefa/snes_classic_controller_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/5Cgfdgh/vpn_private_apk_free_download.pdfIn PDF document text
    • http://jakartapro.xyz/xavodozakaradovifirime0a8n6.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/bb703.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/midejojixafipuviz.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/9974611.pdfIn PDF document text
    • http://retys.space/blockbuster_ceo_who_turned_down_netflixik0fv.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/8jdijie/free_fire_diamond_top_up_nepal.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/f252a6fc85b.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/a9f2315be45587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/38727723091.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/zofofupadowivufewubal.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/ryobi_1900w_electric_chainsaw_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/xiruxasasi.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/carrom_pool_mod_apk_3._0_0.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/book_of_spells_ps3_game.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/kumon_reading_f2_answers.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5328 bytes
SHA-256: 7f4b3a5c26a6da940f87088645aefdea78fd3908fa1f74ed4ed4ba1d067c78b7
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10360 bytes
SHA-256: ce6d9956f777d5600c97ad25ed0d0e86d95fc3e9d60e279562ef83419b082cc9