Malicious PDF — malware analysis report

Static analysis result for SHA-256 de63c83d54a70693…

MALICIOUS

PDF

72.9 KB Created: 2021-02-20 08:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ba8877941b6c5f5d58b2aceacc9dbbd SHA-1: 18a6c4f576f50b91591f4d7631ba545777691641 SHA-256: de63c83d54a70693d7683e4ba13d974fff8ccd531bf203037d8f67ff3067fb54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

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://baarspo.ru/strik?utm_term=excellence+playa+mujeres+private+yacht+excursions PDF link annotation
    • https://cdn.sqhk.co/novozefox/c4OQIww/65909835854.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/igcghgd/sakixagadejapetumawegidol.pdfIn PDF document text
    • http://opros.xyz/fukimuravugepitujaguwtyc3m.pdfIn PDF document text
    • http://pupijepu.22web.org/balesiwukikon.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/mmkifia/talking_animals_in_dreams.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459165/normal_5fc684a83ae17.pdfIn PDF document text
    • http://springwin.space/lekenolibotwdsmx.pdfIn PDF document text
    • http://newser.site/baby_boom_my_newborn_sister_online_game5r68r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_6023d6e5ad427.pdfIn PDF document text
    • http://samyog.ru/how_to_repair_a_panasonic_plasma_tv_with_blinking_ledmunnx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexuwusifo.epizy.com/folifubivapukoj.pdfIn PDF document text
    • http://molodetagako.epizy.com/11089662101.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/46566477752.pdfIn PDF document text
    • http://zugumez.rf.gd/lancaster_city_council_planning_validation_guide.pdfIn PDF document text
    • http://dudowowadoz.rf.gd/2414730707.pdfIn PDF document text
    • http://xozutafutigifa.rf.gd/munuvezuroperukiwoxe.pdfIn PDF document text
    • http://watekiz.rf.gd/business_development_planning_template.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 5436 bytes
SHA-256: 71afdd09ff6437cf0e35ce3115abb204056988bc1fea78e9fa76a1b72baeb027
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 11276 bytes
SHA-256: 58db78e5e302ff2bed3be9d094203872e43dc63fd0da41c542ed206d9c294abb

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