Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f0e59aa4fb98ba…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 01:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 227f2ef614aa2374194523f2076a330f SHA-1: 8ea4f5fcfcf89d3ee076d06d872a17d0fb1251b0 SHA-256: 40f0e59aa4fb98ba5f1da8103d2018355cb4f45136c89b307a70345157899a59
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to drive traffic or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=how+to+get+your+best+friend+heart+back+on+snapchat PDF link annotation
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/xogoze-xodem.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/heQKVRw/janapadalu_folk_songs.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/todos_los_verbos_en_ingles_conjugados4y7q9.pdfIn PDF document text
    • http://keksik24.ru/9333814858pkg3b.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/chjzjbw/download_game_transport_empire_steam_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/3ggXbmu/network_framework_3._5_free.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/4802686.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/6005717.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/OhthdRY/umc_hospital_jackson_ms_address.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/gfYM0gg/high_mx_player_web_series_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/NGRjdhk/this_means_war_movie_soundtrack_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/VDidieN/bubble_witch_3_saga_mod_apk_happymod.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/xalexojaxipud/lunch_invitation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/is_there_monsters_vs_aliens_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53d3831-3cee-4a1c-84c6-2339414e0773/how_to_map_an_image_in_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/borivomikojib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d1b7ec-c491-4665-a1ba-fbbd2ff8fe25/telafakidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165145eb-04ee-4cf3-8303-b8b17d38c330/nawavidufamukubi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/effect_of_slope_on_runoff.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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 5744 bytes
SHA-256: 513485ff72492d53028250e3a7b2ed903e4c8b3155b0ad6a6793da7990b06204
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 11312 bytes
SHA-256: 35b70f70a58d57e30480874326eafcaf65538184610b0bcf188b3af9b38120d2

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