Malicious PDF — malware analysis report

Static analysis result for SHA-256 70156333a783a3a1…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 19:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a00287c6a0e6046582f6534a0259568 SHA-1: 134d6030f791260a0210f2aa580329cad7525633 SHA-256: 70156333a783a3a16dea9b13d9b433f3ffa65ebdb924db8a0d177a08f808ba80
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=tratamento+cancer+de+colo+de+utero+pdf PDF link annotation
    • http://resimpub.com/dyson_dc39_filter_wash93nzj.pdfIn PDF document text
    • http://medicinfo.online/5463830958ccwfj.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/4e9b650.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/f68b4b5a492.pdfIn PDF document text
    • http://lidlid.xyz/philips_btm2180_37_micro_music_systemvm4e9.pdfIn PDF document text
    • http://wekeb.space/50083930936kpdc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_6039f1f5d5ea5.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/6963321.pdfIn PDF document text
    • http://usecabinets.xyz/i_robot_2_2020m0940.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/229197.pdfIn PDF document text
    • http://expressvpn.store/cascading_style_sheet_in_html_program43a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_604ab4ecb69d8.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/how_to_use_nitecore_charger.pdfIn PDF document text
    • http://shoplus.info/the_sims_freeplay_dinheiro_infinito_2020_apkiol6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_60317fda066d6.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/6699563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/042035b5-9506-4fe8-a724-bc4bbce4905c/ronijiberunolitigosun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97acb4ae-9a63-423a-bcf6-8c7de8de5323/how_to_export_latex_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aff6d7-da1c-4621-864a-25315f058a86/cooking_oil_chemical_equation.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/keviwuvilamagoxowune.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/jujejasilow.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/how_to_arrange_numbers_in_decreasing_order.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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 5072 bytes
SHA-256: b4cfe825f0c1ddea81cc9c647612890482e832eab37864aeebbc3f46c2811e55
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 12684 bytes
SHA-256: 5827784283223cef7a5e1a699d34e58113cba7eab4ee3858b70850aba24ffea8

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