Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd97eb207bb84dc…

MALICIOUS

PDF

81.1 KB Created: 2021-04-18 16:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bad34f81a3de2c709e3af85993784e71 SHA-1: 59f296ccb4fdcc23dc6ff8b41cd15c732d01f34f SHA-256: 5cd97eb207bb84dc2f95dff95c43f15fdf35457d37a8321f1f2e081cb7f6a7bc
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9992

Heuristics 4

  • 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=proform+le+tour+de+france+4.0+spin+bike+review PDF link annotation
    • http://natlab.ru/dokenixavaveta5r60r.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/Ogjiese/41071887753.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/a_certification_for_dummies_2019.pdfIn PDF document text
    • http://bit7.top/disowixefowefotjk9nr.pdfIn PDF document text
    • http://fakaripeti.xyz/what_are_professional_goals_for_social_workerszatl9.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/64821920626.pdfIn PDF document text
    • http://todaxip.iblogger.org/game_maker_action_rpg_tutorial.pdfIn PDF document text
    • http://podarokinsta.online/how_to_self_install_fios_internet69icq.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/Bcjjigs/visa_chargeback_guidelines_2018.pdfIn PDF document text
    • http://tevalevas.22web.org/dpe_applicant_copy.pdfIn PDF document text
    • http://noxugimeto.iblogger.org/is_acetone_more_polar_than_hexane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ruvomiwize.rf.gd/list_of_marvel_movies_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/22455910356.pdfIn PDF document text
    • http://duxurulokij.epizy.com/51442678365.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/xejabobetalezawuwabebat.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/how_to_decode_gibson_serial_numbers.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/oppenheim_signals_and_systems_2nd_edition.pdfIn PDF document text
    • http://fuzulaj.rf.gd/muninanarewakawigosej.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/ielts_writing_answer_sheet_task_1_and_2.pdfIn PDF document text
    • http://dopugidov.rf.gd/67054546220.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/wawopivibu.pdfIn PDF document text
    • http://vidavimutisov.epizy.com/54636427114.pdfIn PDF document text
    • http://duvewukabiwetu.epizy.com/tikokoxupa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5800 bytes
SHA-256: 6ca8d1910ef27d5731942b179366e02a0a4b3b9b3f97f3337533df4829912b6f
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 11388 bytes
SHA-256: 28b6affa6e236a65726c5a144b2fcd2e70360ed2e3b312c7e62aa528ae00c140
font_02_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361