Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b4117a96022a62…

MALICIOUS

PDF

77.4 KB Created: 2021-01-06 14:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cf2796d3fe7ccae54dcf0d84ac804387 SHA-1: 9e0b658e539a10f9209a4e009282e63208515c6b SHA-256: 51b4117a96022a629c57ba5d7db016e7fda95442359c450c2023d0254b0970b6
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=total+wine+return+policy+wedding PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5fb640cf9ffb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f98a5949ac7e.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/xazipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fdabc6c84692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87e0ad8706c.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/5f265109.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/0ff83c96-b348-4de2-93f9-ee3a0441f846/wamekebososuluromezaxut.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/kelikunize.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/26833320273.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/ordering_fractions_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/43671846326.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/kofuxixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93e8491-cdd7-47a4-83b7-84b65fc48518/48948047171.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 8304 bytes
SHA-256: 9b6870504375a203c8393a9cfba3abbc80ea4935d5a9d9a61a7c2f39587d3ace
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5204 bytes
SHA-256: b0e646eb144507670a5f7d5765025a0e3130c4f908756c8568c5372bbd70a6d4
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10628 bytes
SHA-256: db8cc9cb718c57c5659fd399745047644b4955219cb490b8af16c144eedee026

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