Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd1f38e5e8cf93…

MALICIOUS

PDF

74.9 KB Created: 2020-11-12 15:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 88eced8368e796a665eb64fbf70f1bd6 SHA-1: d5ae3694f2cd0f7d84c209ad4395ea14cfcf5999 SHA-256: e5fd1f38e5e8cf9320462c6aaacc0e5abf361ee5aaf94c96f421dde1da61f1b8
96 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 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 0.9998

Heuristics 4

  • 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://traffset.ru/123?utm_term=the+burial+of+the+count+of+orgaz PDF link annotation
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/4734621.pdfIn PDF document text
    • https://matoxidatu.weebly.com/uploads/1/3/4/6/134602194/3495295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f9d86d370b42.pdfIn PDF document text
    • https://devuxitimon.weebly.com/uploads/1/3/4/5/134596282/vofenoxobusamomukel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fa55ad1a4e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5f8da97881f98.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/8dbe08bf-1d73-4aca-b328-d554be483eff/15729312176.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/povamiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f6bfb6-3e0f-4a86-8ffb-87e5bc6ce0d4/vipabufobifiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/iowa_math_test_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc5732b-0464-4e6b-ab03-ec645c6aa0d4/14974902604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be51420b-2034-4200-92f6-ee98a30f1f23/30763198487.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/15074558732.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/4993843012.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_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 10012 bytes
SHA-256: 3514e436cb4b273850fd88d6352392bff9c2f54dcab8d12b9e38dd53db4db635
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 5104 bytes
SHA-256: d0ddf138883d5f1b50d9023eab7325a81f0f2278968ac821d3bc80e1ae16e798
font_02_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10444 bytes
SHA-256: 1a034bc3e775c931dbae720b4cc04fe0ba0f8881878248ab780e8764fb61786a

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