Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ba75e4d355c4d1…

MALICIOUS

PDF

62.4 KB Created: 2020-12-09 17:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c301928ff05314764dbe553a11090742 SHA-1: 806d24f92b223a66d69425895908554e274e1c68 SHA-256: 14ba75e4d355c4d1b4031d3b0beab02b64fd685cf4d9ccd61c906c81e0290071
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://traffmen.ru/123?utm_term=jxd+s192k+games', are designed to lead users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=jxd+s192k+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fb8a49f26fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_5f9f42384eaca.pdfIn PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/2829377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5f8f3d0f3a121.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/velukinogej.pdfIn PDF document text
    • https://fifevogu.weebly.com/uploads/1/3/4/6/134602809/watasebumeruwim.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/2525796.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/555794d8-99b6-4685-851b-6eb581660309/microsoft_application_architecture_guide_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c007ff13940aa23ee6b2/t/5fc1684beaf37e3b64d122c1/1606510669759/61686772224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176aa03d-5be1-4995-b3dc-95c087644828/unblocked_games_basketball_legends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e076d94-ef9a-4459-a424-7da0d9051e5e/the_lord_is_real_blackstreet_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/nojoboxetumafuwivax.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/google_play_store_download_apk_mirror.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_off0000b6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A4 5480 bytes
SHA-256: 47dc8da43a3142e829c0619ef77ec2c78f2f4d76d79905e4e2951d2352b9f4ec
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 10388 bytes
SHA-256: 8390f0d04a584c337526ff806b14449c052d220d3f9e222f1e720b635e7378f7

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