Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ad127b55057711…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3137f51826ff5ead1e407b2e3a3c45cb SHA-1: 69c626c67e9748ec20b4730b493cfe35e610d1ac SHA-256: 37ad127b550577116050e0d20068d971c70e562b30c9344c4366ad805ece84e5
146 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It embeds external URIs, with a primary malicious URL being https://mezovuduw.ru/strik, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to network security keys, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://mezovuduw.ru/strik?utm_term=network+security+key+for+mobile+hotspot+iphone PDF link annotation
    • http://beliyden.xyz/how_much_is_baby_grand_piano_worthxp2eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_6008e4e2054de.pdfIn PDF document text
    • http://zarabatyivat.ru/10098779564ko3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fea3695f106d.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/jjiHjiW/nubaselunatuko.pdfIn PDF document text
    • http://mx50off.pro/lazarillo_de_tormes_quinto_tratado_resumenspak3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fe8f7a8043ea.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/hihcJq6/83457720710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_603c690abec21.pdfIn PDF document text
    • http://barberking.best/2982186347mmecy.pdfIn PDF document text
    • http://damita.fun/sipolobiwigojozuddinc.pdfIn PDF document text
    • http://igafnd.org/kopovjx2a2.pdfIn PDF document text
    • http://islta.fun/what_is_the_main_idea_of_the_true_story_of_the_three_little_pigsfkoqg.pdfIn PDF document text
    • http://yozi.store/www.freegamesdl.net_password_nfs_mos6qt5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_600eafe11de76.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/benuka/mrs_dalloway_full_text.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_92bf035aa4fa473d9b4c497fe0cbe924.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_2fcc695f6e364297aefe0470c7b28ec8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/jorebima.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/casio_ga-100c_change_time.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_37297c21efdb4a048139f0939aa1f5c5.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_40ecf60d37d44630aa1670b6f127e2dd.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_20790900363a4017a7a9bb791f6e395f.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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5412 bytes
SHA-256: dcc4dd462b3fb89d9e4b8fb8627fdf5490a3b813c830592006fc906d739161c1
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11104 bytes
SHA-256: 5e6c71425a4c3a51cc561e153b40f1ab41480740a9af16bf8b059671a4d88f93