Malicious PDF — malware analysis report

Static analysis result for SHA-256 93872de88dbad2f2…

MALICIOUS

PDF

91.1 KB Created: 2021-02-28 07:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5641fe71c34b94388271efe4b177a78 SHA-1: 79eb0225c164253a3d98fa816a16bfbdd45a9e97 SHA-256: 93872de88dbad2f21f90ed0e07eccc4e04329b85e8e3075d6f3d515fd2f830fc
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

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://druttle.ru/aws?utm_term=how+to+connect+sony+dav-dz230+to+tv PDF link annotation
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/4230094.pdfIn PDF document text
    • http://sks-expertiza.ru/important_articles_of_indian_constitution_for_ias_examq2q2f.pdfIn PDF document text
    • http://ctyr.ru/jurnal_filariasis_20173fy5d.pdfIn PDF document text
    • http://kokilubowo.22web.org/caller_name_ringtone_app_free.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/339e96.pdfIn PDF document text
    • http://byt-upak.ru/41597619068p036z.pdfIn PDF document text
    • http://nepujimab.22web.org/frasers_hospitality_trust_annual_report_2018.pdfIn PDF document text
    • http://meetsoda.pro/adobe_xd_cc_fully7qk7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banolepepo.epizy.com/bein_sport_remote_control_android.pdfIn PDF document text
    • http://tufomatewivade.rf.gd/como_pasar_milesimas_de_pulgada_a_milimetros.pdfIn PDF document text
    • http://mizuvawilukilel.rf.gd/risugikoraxumapifetavina.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/2438208668.pdfIn PDF document text
    • http://pozaberu.rf.gd/administrative_court_judicial_review_form.pdfIn PDF document text
    • http://wifotuzo.rf.gd/esquema_metodolgico_de_la_investigacion.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_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 5540 bytes
SHA-256: 204bcbd5ce6aa6768604e2291e34b25bda2c47fbf1832e2913fb83e3d6713d28
font_01_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 12000 bytes
SHA-256: 28d01ac5660d86356101f5b076d0017ba9d4b5cbf83ed1f344afca6aa3c6ba41

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