Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e412cf49871b3ff…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 00:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1cef4c07ae70504abadc32fdb03a6da SHA-1: 5a09d5065ce129ba0c6cd946de085d1b98e943f8 SHA-256: 4e412cf49871b3ff289d4ee5f48ee0e34c6abfc587e25782ab22423a8186f43c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=dell+e7450+features PDF link annotation
    • http://salonop.xyz/liluduju3bkub.pdfIn PDF document text
    • http://summ-green.fun/392761372907wczj.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ion_profile_usb_turntable_software.pdfIn PDF document text
    • http://erogan24.website/best_stock_brokers_20201ep3b.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/3443539.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/jonelafovivepugaxadu.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/vawukazawegovol.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/9eff3f.pdfIn PDF document text
    • http://irisca.online/rental_car_agreement_hertz_stockl0vok.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/fisidugi.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/e8a2f3a60d30ce1.pdfIn PDF document text
    • https://lubafotet.weebly.com/uploads/1/3/1/3/131380208/fenerivugika.pdfIn PDF document text
    • http://intekzafast.online/7594210132zr6tk.pdfIn PDF document text
    • http://nudistoff.club/booklet_template_illustratorh8p3a.pdfIn PDF document text
    • http://uscreditscore.info/utorrent_web_for_windows_10nm9ht.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/5c3561c6.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/36408923625.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/2600762.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/jotufi-kajawixebodapil.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/3465055.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/nosepevozux/ronawabomerubofijaxotu.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/a_letter_logo_design.pdfIn PDF document text
    • http://betakudo.atwebpages.com/bose_rc-pws_iii_universal_remote_control_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/what_are_fun_quiz_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/how_to_hook_up_dvd_player_to_tv_with_converter_box.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/behringer_xenyx_q802usb_manuale_italiano.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_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 5192 bytes
SHA-256: 3de0800dc0cd413ae4efb77a5031b845627fd7866f759dba971851d77bb85966
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 11112 bytes
SHA-256: 5b2d8f8c6e93ff1992e6c54a7192ee8c10db32ccbf657c7cca97cb18b8bd7702