Malicious PDF — malware analysis report

Static analysis result for SHA-256 1681d210d409b6f7…

MALICIOUS

PDF

123.2 KB Created: 2021-02-17 17:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 67031addda5a99f8e19da4f424479733 SHA-1: 276386c59d5e7a6865241a5916ef6a149268818e SHA-256: 1681d210d409b6f74a1c249e52a70b4a1874360604eda33695384a3df23bd080
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=soccer+resistance+band+exercises PDF link annotation
    • http://philonio.online/vametavipeytnsw.pdfIn PDF document text
    • http://italywom.space/effective_half_life_calculation_pharmacokineticswnq3t.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/82696851464.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/hgghbPp/amazon_go_grocery_store_technology.pdfIn PDF document text
    • http://choosemadam.site/cv1_coffee_maker_instructionspxce5.pdfIn PDF document text
    • http://domainlimax.xyz/e_myth_contractor_audiobookr36mo.pdfIn PDF document text
    • http://noncomform.space/xuwumumejexaki1w1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/UmuO9Un/jopeled.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/jfhb5hg/download_game_real_dragon_sim_3d_mod_apk.pdfIn PDF document text
    • http://goodshopsales.xyz/college_algebra_2nd_edition_julie_millery9vra.pdfIn PDF document text
    • http://uaportal.site/23471602261xayxp.pdfIn PDF document text
    • http://domsale.xyz/21750383778yqrpi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipariwemarisu.rf.gd/madexekag.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/livavutuzal.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/42751455586.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/glitter_in_the_air_piano_sheet.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/jingle_bell_rock_jazz_piano_sheet_music.pdfIn PDF document text
    • http://wuxejosijaja.epizy.com/68244372434.pdfIn PDF document text
    • http://zukowuneze.rf.gd/97771904434.pdfIn PDF document text
    • http://jezesukawug.rf.gd/67721654511.pdfIn PDF document text
    • http://vulofuza.epizy.com/motapokidavaduxu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/aladdin_friend_like_me_sheet_music.pdfIn PDF document text
    • http://dipusoxitiruvu.rf.gd/wholesome_meme_templates.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_off0001a535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A535 5212 bytes
SHA-256: 02ec66bfdc42e42af5b823ad5efff86795dc06228f0758627852b84e8d7f12d3
font_01_sfnt_off0001b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6FA 11936 bytes
SHA-256: 6d1c6891dc7de512fc7507fbafd46e77aa77cf0ea70f7d80a3f19892bfd98880

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