Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5abc85a1b7121e4…

MALICIOUS

PDF

99.3 KB Created: 2021-03-22 01:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5aab65ada8b2d578327f84a6268cc1a SHA-1: 8cf20e8251c27651a6fd73c99c0f33684cccf2ac SHA-256: c5abc85a1b7121e4a2499927a0caf9351483118e8c07bb693ce9e692f4b2d311
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9981

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maypoin.ru/123?utm_term=professional+audio+editing+software+for+android PDF link annotation
    • http://cosmeteca.com/39515103376e9lfb.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/what_is_the_menu_for_jersey_mikes_subsrcmpt.pdfIn PDF document text
    • http://shoop-fh.ru/guidepoint_systems_phone_numberm4iwe.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/nejadijuwawigalufalok3yak1.pdfIn PDF document text
    • http://hangzhoumetal.ru/la_educacin_media_superior_en_mxico_balance_y_perspectivas4lw6b.pdfIn PDF document text
    • http://metryck.info/2nd_grade_money_word_problems8y9bi.pdfIn PDF document text
    • http://torchland.xyz/rezebiguvu06hyr.pdfIn PDF document text
    • http://fasad-dom.site/pilaluwifidiikrth.pdfIn PDF document text
    • http://sehq.xyz/69422639011desf1.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/sikuva/abandono_escolar_media_superior.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/video_show_app_install.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/us_history_chapter_19_section_3.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/fvd_flash_video_er_chrome_extension.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_deeeb5918b6d42958dead82072feeff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/how_to_start_a_career_in_cyber_security_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/24627119201.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_735a9f446b884765806df1f67e1d5864.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/79671517438.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/how_to_use_the_8_qt_instant_pot.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/caulfield_cup_field_and_form_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/what_is_builder_demand_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/41217912478.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_7d87d458aae541e3b6d08409c9d6b3df.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 20664 bytes
SHA-256: 4a81fe74da15ad7fd53585899032a63a5171340fb7139248fbda6c35af421ffd
font_01_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 5168 bytes
SHA-256: c9ef29be5a4a10ba68871743f425e3335fe6f653b1b164499452d5c0921ae106
font_02_sfnt_off0001429a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429A 11536 bytes
SHA-256: 003a8a5c1a25668943a184a41554421329aa5ed76bb9a9e638309b67f41e1851
font_03_sfnt_off00016982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16982 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501