Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e89c9dd0bc75b6…

MALICIOUS

PDF

90.4 KB Created: 2021-02-28 13:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2afdd72434eb064a1f50510ee4457bbd SHA-1: b8f972f92a74715fa9450004c12a437516df838e SHA-256: 90e89c9dd0bc75b6a3b108d4aff6536c84d35dda20d1fb3a63b75880bd833c21
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to lead the user to a compromised or malicious site. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=how+did+edison+and+tesla+meet PDF link annotation
    • http://lamaded.mywebcommunity.org/59208904804.pdfIn PDF document text
    • http://fajamad.mypressonline.com/pafog.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/crown_xti_4002_review.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/tumidotubanaguk.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/8ehcibX/alien_shooter_2_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_601341bdd01a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5ff2ff2db00d2.pdfIn PDF document text
    • http://titanovyi-filtr.ru/roman_catholic_telugu_audio_songs_freejxtp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fddf477cb7ea.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/before_i_fall_book_vs_movie.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/68988198273.pdfIn PDF document text
    • http://cosmicgig.com/futenokisaxuzonl95u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_6034a2327132d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_602514cc59d63.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/52200103229.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/85251776152.pdfIn PDF document text
    • https://cdn.sqhk.co/fokapalo/hb45Bia/nubefefiziv.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/banula/shahenshah_2019_bengali_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/3524889333.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/somaboduvifen.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/chevy_impala_2016_user_manual.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/goniwefifujajopufexudumi.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_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 4928 bytes
SHA-256: 244f8ba3f90a8d70efa5b68a4f8500e840c3bc50889f6bb0c009dd5809137838
font_01_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 11592 bytes
SHA-256: d2eddc90dc3ab89350eb70acfa5e972071abcc78d0e079c81b76978bbcd93729

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