Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fd2924a31f84c9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 10:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c7b9608cc103c45891e709344ed1be16 SHA-1: 07eecd2f794dd75211b4cb8a5dd0806972886171 SHA-256: f3fd2924a31f84c92ed7f238c988d5f2e601f43e288d68248d33f9b67cdccd1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are structured to appear as legitimate downloadable documents, such as academic papers or software catalogs. This suggests a phishing or scam campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=contoh+skripsi+pendidikan+agama+islam+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fe2382d4fabf.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dgfjhgh/mastercraft_x10_surfing.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/uhaFhdy/skype_for_business_lync_2013_free.pdfIn PDF document text
    • http://it50life.pro/medelujojatelixuluza8dc1l.pdfIn PDF document text
    • http://trickyturkey.com/ranco_thermostat_cataloguenj85l.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/89277682659.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/0KhaTje/photo_mixer_app_free_download_for_android.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/laziwisuduwirisuzim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6011925fb8bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_602d01fa9a3c8.pdfIn PDF document text
    • http://getallcreditscores.info/how_much_does_a_data_analyst_make_ukd77x7.pdfIn PDF document text
    • http://world-wildshop.com/7020399245eiaif.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/95733068236.pdfIn PDF document text
    • http://vknart.xyz/what_is_cv_in_afrikaans5mmjg.pdfIn PDF document text
    • http://trastenmyqort.online/how_to_replace_the_battery_in_an_ipod_nano_6th_generation30jg2.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/13116777299.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jfDKZsb/daviz.pdfIn PDF document text
    • http://select-get.top/45551311432bdhjx.pdfIn PDF document text
    • http://on-arenas.com/65471851572fw53n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_601cb4e3069ed.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/2574812628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_d720bbdca29340eaa779fb6cf2547b5e.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_fec12fc05e56467f80cc8d5aa8bd12b9.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_38ce24fb2de143578e5c7bb04bd37970.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_9c5e99413e5c4100a5b5175afb08f6ed.pdf?index=trueIn 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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 5424 bytes
SHA-256: f6ca88b7911c62330655b0276db5df143405f824558576c6f7177b6f386a0800
font_01_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 10420 bytes
SHA-256: 78de00a659486c4a1cdf9567c1824fe154d2aa081f874ddc36905e110b53adf1

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