Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec744b4939545e64…

MALICIOUS

PDF

52.7 KB Created: 2020-11-06 23:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bc566a2ebc7759f06cc3fa470a9941a5 SHA-1: 7780105901290ae2ae4e84017ae6c0d242226e7f SHA-256: ec744b4939545e641098c797255d739e00f6380ea0ea9727a46a65fc4680d0c5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating a link farm with multiple external PDF links, one of which is a suspicious URL on 'traffking.ru'. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded PDF objects and the nature of the link farm suggest an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or phishing.

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://traffking.ru/123?keyword=the+official+guide+to+the+toefl+test+pdf PDF link annotation
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/bodubimofikeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8d8bb37530c.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/99f9c227-1967-4326-af1a-8feb8e14a028/wakenuzinimu.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/fetozusafokasesinuxova.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/arcada_de_frohse.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/23639924055.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/golf_clash_club_wind_guide_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d41003-ca2c-497a-a09d-fbc8f61bd20b/tijuxalapepidisaxijuper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f62db7f-11ea-45fe-8d02-75e324b4262a/sight_singing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d0866a-5af2-47c9-b0e8-5c8dec2e22c6/21464301822.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/what_are_the_disadvantages_of_plastic_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976bac85-5a3c-477b-adfd-3363e533106b/lost_in_the_desert_case_study.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/american_street_ibi_zoboi.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/tubijawavada.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_off00007abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABC 5268 bytes
SHA-256: 87eac30ad0b6ebcbecfffacf0464fd75070cc833daeccf32ac40b5d250881de9
font_01_sfnt_off00008cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAE 10716 bytes
SHA-256: 858ad336ffc0420f0843bc555523f6e919041ba38915277642f364acde410123
font_02_sfnt_off0000b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 16028 bytes
SHA-256: 3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16

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