Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a484c1637a487f…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 00:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79db3bb8efd407db1c93a2c878678e9e SHA-1: 78897717c3aa358e664ed62657004d9b6f6a216e SHA-256: 52a484c1637a487f7c639e52bd0e5c401d480b72eb466582d5c0641bc2716d7a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, masquerading as a book download, contains multiple external links, including one to 'soxebez.ru' which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support this conclusion.

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://soxebez.ru/strik?utm_term=libro+historia+de+las+religiones+pdf PDF link annotation
    • http://luxasireku.sportsontheweb.net/69240129100.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/f8KNR77/taxi_driver_sim_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/hTxiaz8/bawakirifuxajajufiwozigu.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/recent_trends_in_human_resource_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_601f9e4e41b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_605847c86ff8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381101/normal_5fffdc91e7ac0.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/hbhcX75/mizomuguzesobugasapewe.pdfIn PDF document text
    • http://silkhfig.bid/762716818474lncu.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/i7CBJDp/easy_to_sing_karaoke_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/hgjFghc/60594980252.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hgDggmz/ukraine_map_euro_truck_simulator_2.pdfIn PDF document text
    • http://ru-dev.xyz/3060341720v2zem.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/juzewojavomofew/15094724161.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/61427986883.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/fowivakaninogeliredog.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/38733184513.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5384 bytes
SHA-256: a8df08bed880e6680b89712b012b6428f086f6884bab2aca694520ef3a7065f5
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 12128 bytes
SHA-256: 7aa71b1ab47869c4129432670e0c5203d2eee5d008e04b2d2e0ad3164fe662c2

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