Malicious PDF — malware analysis report

Static analysis result for SHA-256 79352e2721aa9b96…

MALICIOUS

PDF

47.7 KB Created: 2020-11-08 02:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8d138462de1e2608b086271a142b3433 SHA-1: 158b68651c64e89168f42f546c03ce77273c7ac4 SHA-256: 79352e2721aa9b96808a1673158520765899a3cbb30b78b7d1d55e88d0550182
96 Risk Score

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://traffset.ru/aws?keyword=month+to+month+rental+agreement+mn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8aaa0b32092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bumukixux.files.wordpress.com/2020/11/property_inventory_template.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/bmi_index_chart_child.pdfIn PDF document text
    • https://wejukapejasi.files.wordpress.com/2020/11/wetozoge.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/briggs_and_stratton_flywheel_key_home_depot.pdfIn PDF document text
    • https://gosezojez.files.wordpress.com/2020/11/simulado_construtivismo_de_piaget_a_emilia_ferreiro.pdfIn PDF document text
    • https://delutubaradu.files.wordpress.com/2020/11/wogagetesagesuvega.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/41377411743.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/mifitetejebalen.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/vernonia_school_district_v._acton_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3a213b-fb53-4988-ad50-8ae674c44bb5/vekejiwisopow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d000682-47ca-4b80-a017-0261e3bdb934/rupot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041dfdad-4584-431a-a275-cd5fdb3a0a2b/moxomudak.pdfIn PDF document text
    • https://xewavevu.files.wordpress.com/2020/11/55102498877.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 4928 bytes
SHA-256: ab2b494e88d40a828d26cf32ce03a30569e88014293a99b3aae04bc3226fa2c8
font_01_sfnt_off00008b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 12416 bytes
SHA-256: 88529469451c1a394e36766713ccec382bb9c7cce7a04cd7c5ab5dc776bc83c3