Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d059518e0171b9f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 01:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 912cd4f3dab0268fcf436a72630227fc SHA-1: 97c008d9042b53f00b3675368a3f2ecc4e25b67e SHA-256: 5d059518e0171b9fe16e11e80e8b3ae0e6eb9c67db7192071bce2c8479d0717b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to product names and application details, likely serving as a lure.

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://seumenha.ru/strik?utm_term=rca+sound+bar+rts7010b+cable PDF link annotation
    • http://tatanip.medianewsonline.com/54945034289.pdfIn PDF document text
    • http://italiabeach.space/kiferebuserepoliwuf5kh3.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/jubuxatomizu.pdfIn PDF document text
    • http://markettop.pro/musescore_sheet_music_piano3tgv1.pdfIn PDF document text
    • http://spainsale.pro/c_t_o_ka_full_formo5cj1.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/cfr9ggG/filopo.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/danoduwovegepunoxixarog.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/fhjgfSi/thalyrus_medieval_warfare_weapons.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/58215349746.pdfIn PDF document text
    • http://lenulari.mypressonline.com/actualits_internationales_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/tjecChf/24771187873.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/pidujotosulavideka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurosuforudev.atwebpages.com/cfmeu_rdo_calendar_2020_vic.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/55282063925.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_7cc8513568724073ac63964b33b51c49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/nomiguxiva.pdfIn PDF document text
    • http://kopolug.myartsonline.com/23796744866.pdfIn PDF document text
    • http://xijejuvi.myartsonline.com/what_is_the_toughest_sql_query_optimization.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_acd2eb344f034fbd927f8d5ef865375a.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5356 bytes
SHA-256: a13cc0168c4d621eaa979be15dc87cca14b22114e86d81169a11bd797e52ed04
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10420 bytes
SHA-256: 41f6d01eedacd396bc6abe8d046ee9228afcf00bf8ff2e246cc43dd263402cfc

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