Malicious PDF — malware analysis report

Static analysis result for SHA-256 2033f1bcc04841d5…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 15:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c471fe1a5654a183535282b5fe08d734 SHA-1: 9e93f0b20b9f6075df46b0e5ac8c875e14558911 SHA-256: 2033f1bcc04841d52caed2ed9e3276c7224f9eb59c69676e178b74338adcac6c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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 0.9996

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/fafifad_musukokowirom.pdf.
  • 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://mezovuduw.ru/wix?keyword=classical+and+operant+conditioning+examples+worksheet PDF link annotation
    • http://nicechange.space/how_to_program_ge_universal_remote_to_hisense_tvdvluo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_6027df263f7e1.pdfIn PDF document text
    • http://savadaqwe.space/a_sperm_cell_is_a_gamete_or_zygote_and_is_haploid_or_diploidx0sde.pdfIn PDF document text
    • http://worldhold.online/91164012681xgi1y.pdfIn PDF document text
    • http://lastmarkt.ru/how_to_remove_presser_foot0o1t5.pdfIn PDF document text
    • http://reassurez-moi-fr.info/do_re_mi_lyrics_sound_of_music7c019.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/ghcgfr9/duluzixonejomibexigusez.pdfIn PDF document text
    • http://bottlechainworld.com/clsi_esbl_guidelinesknplo.pdfIn PDF document text
    • http://dimivetow.iblogger.org/landslide_causes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_604ae1627a480.pdfIn PDF document text
    • http://garderob-podolsk.ru/30480123036jxxob.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/ibThhWK/83859839717.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/fafifad_musukokowirom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_5fd862332828a.pdfIn PDF document text
    • http://btsworld.org/keurig_2.0_cleaning_kithmoes.pdfIn PDF document text
    • http://onlinetiser.website/dr_abiy_ahmed_bookokima.pdfIn PDF document text
    • http://successinyourlif.website/dizonenoxedobalil6h8w5.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/5jbfHgi/blackbird_fly_camera_malaysia.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/d6096de6a7.pdfIn PDF document text
    • http://fozurev.22web.org/26659000474.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/cHcD3RK/amazon_music_hd_price_germany.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogidefoxafubis.epizy.com/sheet_street_towel_rack.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5616 bytes
SHA-256: f9efba087654b7a1a4cde9d540c54b6e265580591a61e4047a466ea64cfd84de
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10308 bytes
SHA-256: 9ef46ef0fc8f8d5a90d43b87a6906be45f8b810c953d55481f9abbd6cdc8e07b

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