Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b63a0576e799695…

MALICIOUS

PDF

75.3 KB Created: 2021-04-10 04:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e11a19b29a2715ddc81dca2fe1df6cbc SHA-1: 6b58f20ea0710746828b7451d103133f6596c43d SHA-256: 3b63a0576e799695fb5b06f4d87a534ff808761394ecbadcb60ee0b477146c12
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to academic notes, likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=cbse+class+10+nationalism+in+india+notes+pdf PDF link annotation
    • http://my-favshopf.online/best_books_for_stock_market_investing76pgy.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/chaBjdm/42664553164.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/Vq3ghhS/megiwudari.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/h0XW4lC/bonbon_cakery_yummy_and_fluffy_contest.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/hjZrf8d/wordplays_scrabble_help.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/id2thfW/princess_game_salon_angela_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/weripewigi/Lihh4gg/american_football_players_list.pdfIn PDF document text
    • http://reduslim-italy.site/51340352221n7n8g.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/54hjvii/comic_book_reader_app_ios_free.pdfIn PDF document text
    • http://rollernefrit.xyz/rogosogowibigafudi1iegz.pdfIn PDF document text
    • http://intereriia.com/stihl_ms_150_tc_best_pricemloum.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/hbhQIgV/fapakajinu.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/ihihleP/68411725796.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/how_to_set_sportline_stopwatch1fo48.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/fXAqHjg/22963818269.pdfIn PDF document text
    • http://myfoxing.online/online_photo_book_printing_indiayovl4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_8369f87091c6462189653ee37243684a.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_fe3983ef8f6e45d59edecb4052b12dec.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_7fbaba611044420e92f1b4cb106de987.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_d963d6fbe6504c1991ced683ad05e9bb.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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5444 bytes
SHA-256: 7a23f9f3908b6e4621bd425fa55f2d3a01e9b43bac9915801f2db3712f2a9c3b
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10380 bytes
SHA-256: d1f477f473bd6f01faf30b5292c851cdff0d40ce1d2d38f32ee71ed1525936b4

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