Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb501f7466fe8d…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 14:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b1df38194ac31064512427a0e5fa0f86 SHA-1: e4fd5f56b3e5904ab681900e85e9e5b4b037f294 SHA-256: 9dcb501f7466fe8d18a3f21c5a41cb35458b3ed4a02ff4d0443f548df04d0815
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, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

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://zajinet.ru/wix?keyword=7+days+to+die+starvation+guide+ps4 PDF link annotation
    • http://tepifugamokeg.medianewsonline.com/sesevepasoris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_604889b08d253.pdfIn PDF document text
    • http://euromarket.pro/nabexejojl7nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_601002ad957c4.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/saborojasabijirum.pdfIn PDF document text
    • http://pubguckazan.com/14787331022ruzj3.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/xogapawad.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/como_sacar_la_molaridad_de_una_solucion_acuosa.pdfIn PDF document text
    • http://pe50off.info/icom_ic-746pro_service_manual5qygg.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/vawobikotukapebotas.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/bajasoti.pdfIn PDF document text
    • http://itsnat.space/boxuxagurivezabegibavepd5kgk.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/9425410117.pdfIn PDF document text
    • http://tradebot.space/tusutubisapenidivugakixpdwul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_5fda8e68ed575.pdfIn PDF document text
    • http://starvationmod.wikidotIn 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/a28a066f-79a7-4a27-b30c-ec0f63783996/download_driver_hp_laserjet_3015_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/xakofamulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767429bf-c039-415c-b7cc-cc8ca32df769/is_the_old_testament_in_chronological_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04736b55-2ba6-4fb0-89da-269b202f7c90/93734194574.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/31498841440.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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 5328 bytes
SHA-256: c45dd0b5c329f9855cf9c5ae3662b0219aceacb6cbc0d69a6bbbf5bc5c1236ba
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 13976 bytes
SHA-256: 4020a6e2433fc6e90c8149eda523e06418564411fbed74598e4fdc63f3679e14

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