Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3f3bf5076101c8…

MALICIOUS

PDF

63.1 KB Created: 2020-11-16 22:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5065f1a08a341038ca01fbb5e921c156 SHA-1: 186f083538f7b36ada097b4a5be9c21eb7342d73 SHA-256: cc3f3bf5076101c856e6c2ab376af4bcb7d5f4ce30c33511b42ad99c8cf86c12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and suspicious domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for exploitation.

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://traffset.ru/strik?utm_term=root+words+worksheet+pdf PDF link annotation
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/vuvaz-penaxuzewima-moronerit.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/dusuwu_balitorelix_sipivolobarobag.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/mapiva_sokafewo_dinugima.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/8405e.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/nijijosawuwuz-nenopule-rozafi.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/janito-nalowujorukarut.pdfIn PDF document text
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/e9dd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/tratamiento_antienvejecimiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe89ef1d-e6db-44d9-915c-5d5675b4c096/votopevorob.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/dijaramiw.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/cleveland_county_schools_calendar_2019-20.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/bigegakujan.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_off0000bd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD75 5052 bytes
SHA-256: 0ece8181b33eaafbbe1738a038cd7bc5863a644f7cd379e786e9ba0a5a88242b
font_01_sfnt_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 9784 bytes
SHA-256: c5242555864016524b99f43c31a3fe0718415c8c234acf07542fca9fc4703a46

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