Malicious PDF — malware analysis report

Static analysis result for SHA-256 634dafce66f3af36…

MALICIOUS

PDF

80.5 KB Created: 2020-11-13 02:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e24ac6cc28511939ae63fccac33ba020 SHA-1: bda1d4eae099a8c5c83944cd8224e66b44ab71f7 SHA-256: 634dafce66f3af36c71c28c129469ced4e16c5eecd43e33126ba60b8580ea876
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings. One of the extracted URLs, 'https://trafffe.ru/123?utm_term=passive+voice+pdf', is flagged as unknown reputation and is likely the primary malicious destination. The presence of PDF-specific heuristics and ClamAV detection strongly indicates malicious intent, likely for phishing or malware distribution.

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
  • 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://trafffe.ru/123?utm_term=passive+voice+pdf PDF link annotation
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/jimalajewurumepewaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/nombre_alcoro.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/fall_creek_gorge_ithaca_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/76989885842.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/55095856643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bea0a4-0f72-4168-92fe-5e6136816e33/rowitiloxababe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68604ddd-2c83-476c-9508-728a80996769/99437209249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1055095f-838c-478a-a37a-86d026c1b781/nunikiruluzis.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/who_are_the_figures_in_the_cartoon_everyones_a_little_subversive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25593384-60d4-46ca-a6e4-c0dfb1bf6e07/zutuziso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702ff9b8-d582-4014-aa92-56c0759a1087/dunovusoxatinafiwawijawu.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/hampton_bay_umbrella_base_table.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/cleveland_high_school_nc_basketball.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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 7432 bytes
SHA-256: 0a1a841929fc578fcc86b9ca9d4792f23c45af75e538d0661ef8bcc04c45274f
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 5080 bytes
SHA-256: dbb08ad7dfc2de250f79099142300138ea75ce1314becfdbb1c0165734e953e3
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 12408 bytes
SHA-256: e9fc7eafabb3435ff5bf1e2b26a49a659fef21efdceb86a36f35f0dfb0e32b67

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