Malicious PDF — malware analysis report

Static analysis result for SHA-256 a320a087ee9ac3c2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 11:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39c13650b1d4a50f4b3f2d7f5e3e8cf1 SHA-1: b18d43541a7a089dcab4e2209a5ea68b9cb1ff01 SHA-256: a320a087ee9ac3c22425815ece44ed136710aa378744a3e5009e8a88c0592bd8
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, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=pulgadas+milimetros+tabla+conversion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fed172871a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_60127073b9fce.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ZXtQLjb/69927857676.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/48978175493.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/diablo_2_lord_of_destruction_cd_key_generator.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/centos_7_server_guide.pdfIn PDF document text
    • http://bioforce-co.site/how_often_should_you_change_air_purifier_filtercpfeh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5feeb9c5b68bb.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jthbqsu/61099655700.pdfIn PDF document text
    • https://cdn.sqhk.co/makevefix/jebg9JF/covid_alert_nj_error_code_1002.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/sgcopge/41475412314.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/zisobezatolulaw.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/83777044444.pdfIn PDF document text
    • http://lg-copyrightforms.com/30206723848yepgh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fe9d62663819.pdfIn PDF document text
    • http://hushseo.online/dizoridanaduashdc.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/71275427669.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/Vqbjaig/goodreads_choice_awards_2018.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/37856309832.pdfIn PDF document text
    • http://pagebake.com/vopubasilorefujoponaveveso4qm1.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/44951630252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wewamamewiler.atwebpages.com/cdf_and_relationship.pdfIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/arrange_sentence_in_correct_order.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5340 bytes
SHA-256: 05c4de29a3064207ea08a7621b6bcdd82c0e647d9a177f3ee06199e7c0aa281a
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 11168 bytes
SHA-256: 3c403a43b96f0bfafaa753f7c2444084f6e0f2701314b978b0c9db4dbf0f7814
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361