Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afdc990dfa56371…

MALICIOUS

PDF

81.5 KB Created: 2021-04-25 20:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5490ea3cee6fcd0430cc82a579f72fc SHA-1: cb31c8ad4eda1e9f573e7cfa7cc507e84a8f2248 SHA-256: 4afdc990dfa56371df514e1be1dfc7cffde8eea46fb16f739a09065ed12ad3cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to printer installation, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/strik?utm_term=how+to+install+dymo+labelwriter+4xl+on+mac PDF link annotation
    • http://civiliscmq.online/66815911003cp0n1.pdfIn PDF document text
    • http://pemovixo.iblogger.org/washington_state_covid_vaccine_availability.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5fe364c648af1.pdfIn PDF document text
    • http://asia.kiwi/scroll_template_word_freeux8wx.pdfIn PDF document text
    • http://instapriz24.site/how_much_do_you_pay_to_get_out_of_jail_in_monopoly_here_and_now7ca8c.pdfIn PDF document text
    • http://shopyou.online/578814059851z4kx.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/seres.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_600d462c21063.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/april_fools_day_facts.pdfIn PDF document text
    • http://eurosett.net/xbox_live_gold_cards_codescugfg.pdfIn PDF document text
    • http://useporte.xyz/the_summoning_of_everyman_a_student_guide_answersk4mib.pdfIn PDF document text
    • http://sweetmeet.online/the_sociology_project_2._0_freetc971.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/pdf_to_word_ocr_windows.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/18967669470.pdfIn PDF document text
    • http://psyhologrzn.ru/gofofozet708yr.pdfIn PDF document text
    • http://dutebolidetol.iblogger.org/businessman_movie_video_songs_hd.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/53209953740anfb9.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/50684681714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_606b24528b2b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fea4174e0d9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watonorobawar.rf.gd/sajufivavipezavoredebo.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/gagironazabazud.pdfIn PDF document text
    • http://gajikefobazute.rf.gd/luxotafamitodexijugozefuj.pdfIn PDF document text
    • http://wuvasof.epizy.com/how_to_write_a_short_film_script_in_hindi.pdfIn PDF document text
    • http://bajejefi.epizy.com/samsung_un50ku6300f_wall_mount.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_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 5536 bytes
SHA-256: 0543a7d0bc80ce6e14e461642bda301f437bc5545eda20fc1f9655cf69c2ceab
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 11588 bytes
SHA-256: 88c9435c493cd001ab0ed01ca1f04fcf99d963658634e011f2840e306269d2d6

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