Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f001441815772…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 17:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b5b70aa42363d61e1505ea19b206d174 SHA-1: 31cb5f719ec241b427859ba03d5b840662210f3e SHA-256: a13f001441815772dee9573870b8cf9f9294b43fab78f967344beeb1f0e7c47a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms hosted on disposable domains, with a critical heuristic indicating redirection to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, potentially involving JavaScript.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=voice+recorder+pro+apk+quality+apps In PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/1554086.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/hbjiXjf/w3schools_python_dictionary_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/ihbV0ih/mudimo.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/5217982.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/reflexes_sobre_a_arte_alfredo_bosi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/hennjqk/descargar_alien_shooter_td_para_pc.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/63185551691.pdfIn PDF document text
    • http://lienforkid.com/realtek_rtl8188ee_802.11_bgn_drivervl9dv.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/12104c95339fb.pdfIn PDF document text
    • http://donbetosstreettacos.com/50442452247b3uo5.pdfIn PDF document text
    • http://trynon.xyz/is_there_a_reset_button_on_the_whirlpool_cabrio_washer70k6o.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/ocean_biogeochemistry.pdfIn PDF document text
    • https://vixufavem.weebly.com/uploads/1/3/2/6/132683014/3891399.pdfIn PDF document text
    • https://rinejadujasale.weebly.com/uploads/1/3/0/7/130775071/bajiserurozez.pdfIn PDF document text
    • http://italysummer.space/6347372371hdkuh.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/wemixejon.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/686330.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/dxWkhdK/fopoladesatagopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subogerilazelo.atwebpages.com/online_travel_agency_project_report.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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 5324 bytes
SHA-256: acb5457826529330cfb8f1190535e7185a2b66a4819395bee1d66c57c799da85
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10752 bytes
SHA-256: 97680c839c8c737fff510cac9e45cd86958ab3f6d8194f2427a4ebbf6bb6d2cf

Open this report in the interactive analyzer, or submit your own file for analysis.