Malicious PDF — malware analysis report

Static analysis result for SHA-256 16563bbbc1806184…

MALICIOUS

PDF

71.2 KB Created: 2021-04-06 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef0f19d868790e0fc4ccb5f9f82bc493 SHA-1: 265fcc1502ce361f1e8c31a6343afc4e3256472b SHA-256: 16563bbbc180618470127035c81a6770789ae7c167467385ccccb9f0b8d7a50e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Arby's' and 'chicken salad', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=arby%2527s+have+chicken+salad PDF link annotation
    • http://pixujuxe.mypressonline.com/anatomy_and_physiology_of_lactation.pdfIn PDF document text
    • http://gajuduxotam.iblogger.org/40942920848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ff31c43617e4.pdfIn PDF document text
    • http://kabofatifeda.22web.org/introduction_myself_in_english_interview.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_605a62cfd75fe.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/1ighc84/51695266650.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/jeLnBgi/52399044632.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/VHBfjgF/zonifatutet.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/escala_de_braden_q.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/kagakafosaxoxozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe2bc95a380f.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/16979139146.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/Xjagchf/31495141956.pdfIn PDF document text
    • http://pitupunum.iblogger.org/rolasurekuvumote.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/dTxxig6/mekizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasanilu.epizy.com/38537119315.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/excel_macro_to_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c49727d-9bb5-496b-a504-ce58989e76b3/10531765049.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/29523359786.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/arcgis_10._1_keygen_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/fazajijudodow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a744bf-74ce-47ee-aa7d-1e9ff1466429/tovoba.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/bsnl_cdr_crm_user_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 5416 bytes
SHA-256: 1895d5c436ef050b6f91991dc6e169945e4cef8d34c56978059f35d35b826ab5
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 9796 bytes
SHA-256: c2ee9caa35ffb669f673cf5629416926ef5a37c1cf062ba997f8d0ccdd816b56

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