Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c985642108a6b5…

MALICIOUS

PDF

80.5 KB Created: 2021-05-16 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 84da2be901862452483061d26ff8cb63 SHA-1: e2bb462396c74b4bb0ad19c72a5236f2447e0847 SHA-256: 42c985642108a6b5f518b51d3669366e170b8d317f0d844cd4c727326b6e56ea
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=how+to+write+an+elearning+storyboard PDF link annotation
    • http://janipuwibir.mywebcommunity.org/xewijaberebojela.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/wuwazepugaregebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fd67ffe5eed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fd26cffd4840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_6026e769f0668.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/nobivolazinigabazolape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5ff20ca277b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_6034486351eda.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/acls_rhythms.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/zagorijugusinu.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/magnus_chase_hammer_of_thor_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffeb4d50032b.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/skin_biopsy_procedure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5ffb4d2bbd849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojegasofibi.epizy.com/chuyn_nhiu_file_nh_sang_online.pdfIn PDF document text
    • http://xugibomexepef.rf.gd/sevukekig.pdfIn PDF document text
    • http://wesatume.atwebpages.com/wukopemukaj.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_9af02a4a0b1044a39193a3f565fcfcaf.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_7858b318ac604c78b1783cabf86706c7.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_4e360f7033ae4fce82554fdc37ca90e1.pdf?index=trueIn PDF document text
    • http://bowelabu.rf.gd/the_weary_blues_analysis.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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5288 bytes
SHA-256: 746cad3d359bb3f154e4263b9c7c264b1bd834838aba256d98a3e3e9dcdf3273
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 12292 bytes
SHA-256: 42dd94132cf266f3e0b64c4b2fcf9c559c86be013fa44f9da98a1ff7e85c094c

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