Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f95f609074423…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 21:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 234a5b010b67f6b54b5356cc4993f3aa SHA-1: 2fea6cd1044258cf88f4abf95f3076e167419e92 SHA-256: a71f95f60907442365c05fd07eb228b2c3d3048b617e9a389910d8a2520ae549
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for SEO manipulation or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful 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://nipisod.ru/123?utm_term=devotional+songs+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486200/normal_60069ac73751c.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/antifungal_activity_of_plant_extracts.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/ensayo_escritores_de_la_libertad.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/hccCRjZ/52506173664.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/blessed_be_the_name_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_600181999c154.pdfIn PDF document text
    • https://cdn.sqhk.co/febalotifako/jaifohb/top_pop_songs_2019_list.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/calidad_del_aire_medellin.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/gtaigjc/august_alsina_albums_zip.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/pavopolojofex.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/kandungan_kimia_binahong.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/4849716388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6026580a89565.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/blDAA2S/gnomes_garden_2_review.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/vuliwisuwig/1992195095.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/55152625376.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/dd_3.5_tome_of_battle_feats.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/51928562424.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/83385565994.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_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 4992 bytes
SHA-256: 2dc5a78829faac53dde74e9e35b232d41ac997de632ef29380fb41fca2e23948
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 11292 bytes
SHA-256: 7d5ea7b2285371f828c801bc968229113ccfa618ad7e776147c6aca9479f16f9

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