Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0c35e1ec331ac8…

MALICIOUS

PDF

93.2 KB Created: 2021-05-30 17:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 05e499913b4ebe4e1ccb35d407545cc5 SHA-1: 8fffa8c691588c311ce26ca9e453149a0845001b SHA-256: 9b0c35e1ec331ac845c446d8f74c0451ea551f0eec3e5f7b98a25d77b5725e0a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/123?utm_term=android+tablet+battery+case PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474456/normal_6065f5c161d24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5ff93615aed6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5fe1543439e10.pdfIn PDF document text
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/gajixozizixofenil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5ffdc56243534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_604ce020e40fe.pdfIn PDF document text
    • https://nafusifino.weebly.com/uploads/1/3/4/6/134615437/d2cd77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_603e29302c062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_6000ba14e6b2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428035/normal_5fdda0fbad083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_60078b18d7d87.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/nuzoramarobir-wugabuv-roxutafun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5af7bb34-d41c-473a-87e5-22b427959188/clases_de_sistemas_de_informacion_gerencial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4eeccf3-e4d1-4982-9422-1fccf31b9e64/how_to_make_a_probability_distribution_graph_in_minitab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17217688-709b-47e8-8cb5-9124e626f29d/que_significa_soar_que_se_te_caen_los_dientes_de_arriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2c84fb-b1f2-49e5-8649-71dd99be9374/51867050324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500d5d64-674f-46b5-b16f-08d4cd7f1d6b/lotifakezuzewoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8b2c84-8d21-409c-baed-c50cfa5d0222/thomas_and_friends_trainz_a_new_era_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 4952 bytes
SHA-256: a216e7d8611e8c8acf2e30c59ea084908ba92901952acee3b8e863a24d43f4d2
font_01_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 10716 bytes
SHA-256: fc0292ddf3e31e2bf962dc298580851752e8a8cc44fa367689cf49cc1c7a1b78
font_02_sfnt_off00015855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15855 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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