Malicious PDF — malware analysis report

Static analysis result for SHA-256 9726f393d72da59d…

MALICIOUS

PDF

73.1 KB Created: 2020-11-20 14:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1f0e5eb2ca6367d94d863b03d62abfbb SHA-1: 28d12b48736b1043b2f63eb3e7c4119818ad6b3d SHA-256: 9726f393d72da59d3abf01142dfec754e6322f2316cc1b15725ca7b3ec2ab69f
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://trafffi.ru/123?utm_term=the+adoration+of+jenna+fox+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5faf50be178e2.pdfIn PDF document text
    • https://fidumozif.weebly.com/uploads/1/3/4/7/134715024/2473dabb49387d.pdfIn PDF document text
    • https://refaxezadale.weebly.com/uploads/1/3/4/3/134325555/3048222.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/9fc721f314aac.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/7334041.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/topes.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/aeb8e64f-01e5-499b-af1f-ce2f0e808d95/kodi_apk_for_android_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e31019c-9f6a-4018-80db-04a41e5a554c/video_edit_apps_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb00e5f6-3da8-4635-96ad-7afa79be6797/jp_ryan_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324f49df-62b0-4fe0-b692-a73135455ee5/75033823949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63a8db7-9534-4159-9d67-6e8aaabc2032/11832611632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc3661c-a4df-40b0-86b3-fcaf699d2807/los_usos_de_por_y_para_p._171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d80a9ed-c5a8-4fab-a643-8f8dd0a4bc49/86597114271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8a6feb-ae61-4f07-bad7-5ce3dc377a5e/gospel_wonders_noah_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5004600e-99df-4d97-b5e6-16723edce1e1/revokonasasew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8de8fc-728e-4df3-b585-f3901c40ba34/33995108237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e326508-1bb3-44e8-9cfd-9ab518c6e596/zadudoxan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 5012 bytes
SHA-256: ff34c72e0307d3a1c44d2f458dbcb2b0aac9576c0c2b950a0e610a96d3b18d18
font_01_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 10952 bytes
SHA-256: ac2c2a2d043e435b160228858601533fd8fa0a977669855bddfa04ff373e5512
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16896 bytes
SHA-256: 2c7ab919179281a22bff7890f16941d597240e3c4627814676ed533fbce8fed8

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