Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15fc4d59d0c6704…

MALICIOUS

PDF

78.7 KB Created: 2021-04-01 17:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: efa2a96cb6bef162f51bfe4bdea504d4 SHA-1: 54133485060e67d56fafef942bdb9a0f21f4ba79 SHA-256: d15fc4d59d0c6704aa5e7a43ea1c7ecfa07e88ae81b3444586770b60d6079d2b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=guerrilla+capacity+planning+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6021bccc27873.pdfIn PDF document text
    • http://complect-tech.ru/best_uchigatana_infusion_demon_soulsppinx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_6065546eaf158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bc1847a8af.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/16625733698.pdfIn PDF document text
    • http://vkrowl.com/rakerilofupebalugewenopik1aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366989/normal_5ff57fd476ca5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5ff66b48d777c.pdfIn PDF document text
    • http://gravkamen.ru/tifefobiz3aa30.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/jCia4hb/libiwasutow.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hjjelgf/bedtime_music_lullaby_songs_lyrics.pdfIn PDF document text
    • http://topcreditreport.info/moragafinexanarozegam1e7n1.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/54298224300.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/kewejorewetilufegojusif.pdfIn PDF document text
    • http://beautysss.site/60405694726424da.pdfIn PDF document text
    • http://feyakast.online/gubafusamivovajerujetiepfj5.pdfIn PDF document text
    • http://sfhgfje5df.xyz/incident_report_sample_letter_for_cashierdoigp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romapubimowa.onlinewebshop.net/bhagavad_gita_in_english_with_meaning.pdfIn PDF document text
    • http://newepizudef.atwebpages.com/nizawotasovo.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_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 5276 bytes
SHA-256: adf18c71375ec435c1209ebe1598ade01917a416d7ab251776039c11bd620da4
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10904 bytes
SHA-256: f37a40ce0b0dde91f262c9e777f19b9082dec712f2aaf0db86a41de5de696a0e

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