Malicious PDF — malware analysis report

Static analysis result for SHA-256 9348c588ccd6567c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 01:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7632244279a63aab34d4676a2a0f99f1 SHA-1: 752fd47761355687a7dd1207187ce3fc02167678 SHA-256: 9348c588ccd6567c7b0d2d6c08126365da1a0b09422860c7d85997aee295f5db
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, one of which, 'https://jumiwimov.ru/123?utm_term=stock+audit+report+format+excel', is presented in a context suggesting a lure for financial or business-related information. No scripts were extracted, but the presence of many external links and the phishing classification strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jumiwimov.ru/123?utm_term=stock+audit+report+format+excel
    • https://cdn.sqhk.co/xexogataza/jj4ljfq/72342976119.pdf
    • https://cdn.sqhk.co/molivovuki/eM1hgji/hot_springs_story.pdf
    • http://femuxeririta.mygamesonline.org/how_to_watch_global_news_on_apple_tv.pdf
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/cd9afd9fdfb51eb.pdf
    • http://felojagiwubabu.iblogger.org/raw_vegan_bodybuilding_meal_plan.pdf
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/7165977.pdf
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/folij.pdf
    • https://cdn.sqhk.co/kawaxixe/gjsOgiT/let_s_vegas_casino-_slot_roulette.pdf
    • https://ruzowevo.weebly.com/uploads/1/3/1/4/131453610/risenuzepubel.pdf
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/7360f298c53f174.pdf
    • https://cdn.sqhk.co/ladesajisama/ciepzha/i_wish_lyrics_cher_lloyd_ft_t._i.pdf
    • http://xufelaketodo.getenjoyment.net/new_monster_movies_2020.pdf
    • http://xokezuwadem.mygamesonline.org/37161454723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fujadabez/3rd_grade_comprehension_worksheets.pdf
    • http://bexadujozopu.epizy.com/video_manager_chrome.pdf
    • https://s3.amazonaws.com/xidazeze/kuk_university_ba_date_sheet_2019.pdf
    • http://dosamivizapude.rf.gd/oster_bread_maker_5838_recipes.pdf
    • http://ziboporo.epizy.com/borries_markier_systeme_manual.pdf
    • http://punaxixodakuguk.epizy.com/denak.pdf
    • http://xuvekixofeku.onlinewebshop.net/why_does_songs_disappear_from_spotify.pdf
    • http://pupudewasoxo.epizy.com/pusosaxowibadofu.pdf
    • http://gifidabula.atwebpages.com/how_to_clean_a_clogged_bunn_coffee_maker.pdf
    • http://nudobovedazopor.epizy.com/witunelubix.pdf
    • https://s3.amazonaws.com/xilasisefi/wso_consulting_case_interview_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f615.bin
11331449dba412d98e9960419c57072fe03b774a8c255ed5c70e5d21e4dbb55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5360 bytes
font_01_sfnt_off0001084a.bin
72873167a6ec88eee14caebb2c18d7f26d4adbeffa5c13c0bd3066f48d8200f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10572 bytes

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