Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23642d7b80aff24…

MALICIOUS

PDF

80.9 KB Created: 2021-05-11 10:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb01a25cb138c647d7b0b319c9643fa4 SHA-1: d7c83dc34cd5e74453cb06b00ac257420fd2ef1b SHA-256: f23642d7b80aff2453430b026dae3f8f516d67d76b5a5c07cda8525a293738f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=what+does+the+blue+santa+muerte+mean PDF link annotation
    • http://wejuzofibab.medianewsonline.com/que_es_un_base_algebra_lineal.pdfIn PDF document text
    • http://berozava.iblogger.org/android_studio_emulator_install_play_store.pdfIn PDF document text
    • http://ronojalad.22web.org/29209212951.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/bajuse/microsoft_authenticator_mobile_app.pdfIn PDF document text
    • http://govatojajij.epizy.com/bard_guide_feats_5e.pdfIn PDF document text
    • http://livofos.epizy.com/pablo_neruda_always_poem_analysis.pdfIn PDF document text
    • http://zonatenitisa.rf.gd/dykes_to_watch_out_for_2016.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/bawuvumawaxiwadatale.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/pejifulanutuloda.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/nepali_songs_guitar_chords.pdfIn PDF document text
    • http://mebupeb.rf.gd/practical_law_us_new_platform_sign_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783d9f10-a76e-4c65-a7a3-ad1ea18a2d41/how_to_clean_out_brine_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcff192-3bda-4f48-ba20-79569de6ed90/25018493742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83506b1f-83d9-4385-8a48-83675b17dee7/tipos_de_comunicacion_humana_colectiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d811be-ad1d-4ff9-9f82-ab9d53b645fd/rugebabopuvamidosuzufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b2c991-3879-49e1-9395-36482b68e219/court_of_thorns_and_roses_characters.pdfIn PDF document text
    • http://tugojolowok.epizy.com/45625500853.pdfIn PDF document text
    • http://piduxevijurofip.epizy.com/antipodes_global_fund_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850baee-f00b-4e03-a789-f9594807f1d7/the_end_of_dieting_by_dr._joel_fuhrman.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/transformers_optimus_prime_studio_series_05.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb63f632-4662-4a96-a8bd-7541180c8853/72663545097.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_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 5220 bytes
SHA-256: 7b615fdec36de1a19b5902b541128b2e59c2601ff4a0e21477e4d496dbe38b43
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 10420 bytes
SHA-256: 29511300dc29fc3281d43b1b2372c57f60e968864a5e46a33c394d2720ec4203

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