Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6277222ab0be6e2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-28 14:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 244bfff9c8e1f3d550ad3d34ce107cd5 SHA-1: e813dc334b6848d7545291032621832cbcaa5a10 SHA-256: b6277222ab0be6e21b4097fade9ffe1e91fd56d61a9ccc20896d4216ce4bbf3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://gimoguvi.ru/123?utm_term=the+little+dictionary+of+fashion+pdf PDF link annotation
    • http://detonic-official.website/81723912534y049x.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_use_conair_1875_styler.pdfIn PDF document text
    • http://skidki-day.site/what_percent_of_living_organisms_are_made_up_of_cells_quizlet7dcr9.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/pretty_little_liars_cast_season_1_episode_21.pdfIn PDF document text
    • http://greyfruit.space/pounds_to_kg_chartv53pc.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/algebra_2_common_core_textbook_pearson.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/rhetorical_question_grammatical_definition.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/14621175245.pdfIn PDF document text
    • http://socialwave.me/detobuvajaxekut09e2z.pdfIn PDF document text
    • http://ita-women.space/80552647250a6z7q.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/where_is_the_oil_filter_on_a_troy_bilt_pony.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/canon_pixma_mx922_install_ink.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/pubaj.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/98393597289.pdfIn PDF document text
    • http://s7hmus.org/rwby_fanfiction_jaune_abandoned_by_friends15iv0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/nascla_contractors_guide_tennessee.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5296 bytes
SHA-256: 3e68dec2216e873c3e09215d029a7933e94c5a460ca4de1a185dac2549317282
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10592 bytes
SHA-256: c649777eff84f0b48895b02f8b2bdd2517581a9dab74f6c845d8e83bea41bbea