Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa12da3ad7bc3630…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 06:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffc04bdc7fafce4079aeaa81285c3870 SHA-1: 935c29d219e5f7d84bb6fa879a682f1ca893907b SHA-256: aa12da3ad7bc3630e12215f1b6bbeecd3d89a920df8fd2cc146e81b6877d9253
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=tp+link+av500+setup+instructions PDF link annotation
    • http://leririv.sportsontheweb.net/using_multivariate_statistics_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fd085408c8d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5febe22b28866.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/73915788588.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/65659398177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5ff3c2278b269.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://sebafasoro.epizy.com/bose_wave_radio_cd_manual.pdfIn PDF document text
    • http://bededojobafepeb.rf.gd/oreck_xl_vacuum_bags_type_cc.pdfIn PDF document text
    • http://sisizovomejefi.epizy.com/50_shades_of_grey_songs_lyrics.pdfIn PDF document text
    • http://vedogitunenaki.rf.gd/best_reloading_powder_for_308.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/dream_yoga_studio_mclean.pdfIn PDF document text
    • http://begosene.epizy.com/bacterial_meningitis_treatment.pdfIn PDF document text
    • http://vegunag.rf.gd/zuxugedakabojasanazubox.pdfIn PDF document text
    • http://makowadoka.epizy.com/zoxezufapozuvonogid.pdfIn PDF document text
    • http://vevaluvorolimu.rf.gd/bulb_smash_latest_apk.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/muwojawib.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/48989286160.pdfIn PDF document text
    • http://fezesotufixodow.epizy.com/que_es_la_alcalosis_metabolica.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/procesos_de_degradacion_del_suelo.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_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5148 bytes
SHA-256: 6bb1c62e16cd2a094747914a9651e91c20b5bdfbd4880576d00cc18e86f32063
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10556 bytes
SHA-256: a5d71bb1c4f1f4867661334df26671876e8960eda7c548d6a797b88efa6a9cf4
font_02_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e