Malicious PDF — malware analysis report

Static analysis result for SHA-256 af321750839d18e0…

MALICIOUS

PDF

49.8 KB Created: 2020-11-06 12:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31917b8d595d9f986285cec4801cdcbc SHA-1: d756cfc2e7442ec6e5404852020ec8f29fa2d58e SHA-256: af321750839d18e0f86111e72a97fe4edcd0c65b66aa99002b2ad05d3161a894
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 1.0000

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://trafficel.ru/strik?keyword=dna+transcription+and+translation+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5f8bba3f1935b.pdfIn PDF document text
    • https://luwiritogejoti.weebly.com/uploads/1/3/4/2/134266422/lusalavunugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8b836d8d694.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/fovowebon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f9fabe9b9a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f9421fccff00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f9602b56e055.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/3440397.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/04bb4696-1952-40d5-8253-2e67160093c8/48179191245.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/atharva_veda_in_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95890b46-32f4-42ff-929d-2bad5e2c99ac/xibubizowuxisati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818bd148-26e6-4e2f-84f1-51e45ca027f7/18137755524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1156bdb4-2e0a-48f7-a055-f24d8caa2b56/74395621316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f88180-1222-4d76-a4fa-5ac686065a93/one_life_ed_sheeran_apple_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 5104 bytes
SHA-256: 1f5acd8da0f60c7cf890fcb4f0898f6b54bffaca7c3d64bef9f7261ebf02f79b
font_01_sfnt_off0000723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 10500 bytes
SHA-256: 6b614cffdc8b2eb3007c315ea4342bc02acdd57065bb287752c16c869625f1ef
font_02_sfnt_off00009638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9638 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0000ab68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB68 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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