Malicious PDF — malware analysis report

Static analysis result for SHA-256 21348303fb161f4f…

MALICIOUS

PDF

77.0 KB Created: 2021-04-17 14:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84322279a1088e36774b51d385862f4b SHA-1: d2a18db3bb49627380b3bf5975882a48900e7459 SHA-256: 21348303fb161f4fc01c97cd362d45ad291e02bfcb7f879abda21e2a3aa2b68b
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL `https://kuzutuzo.ru/strik?utm_term=motion+sensor+red+light+blinks+3+times` suggests a phishing lure related to a technical query. No scripts were extracted, but the overall structure and URL distribution indicate a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=motion+sensor+red+light+blinks+3+times PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446045/normal_600ecf7458134.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/succession_planning_in_hrm.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://testertumentum.space/junie_b_jones_seriesuallv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_60660035a8e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372972/normal_5fe3846f0bb3b.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_601aa7e6a3b9c.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/low_voltage_transformer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_602d04e46085f.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/69168007102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limekukojaso.epizy.com/54652965085.pdfIn PDF document text
    • http://guziruxasa.epizy.com/texto_argumentativo_exemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d811fa4e-c2c6-4337-93d4-611a9cca4683/marshall_dsl40c_review_andertons.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_451dc003f332405792960e817ce7c49e.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_1c85db38e4d34ec38a6f76c98c9a0788.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_d3fcfa39981b474c95cda33c4befea52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/176198c3-5e4a-4a67-a0e6-c91e5f4db379/kindle_model_number_d00901_hard_reset.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_11c3d540f2fb4cb5a69df18904ede196.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86ea5ed-5643-4f36-a0d2-23cb2e43cec5/rasodukidobidoxutup.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_e0e368a2cc5742ea821694cb0cab4e78.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5404 bytes
SHA-256: 1ec3cef62515850e8ecb81744827a723f0ddbaee301c2bef654636d3b3b42255
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11268 bytes
SHA-256: 21da0461da93146662a4cf5d1c543caaf17fc021d73e353407ca253750cc4a6d

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