Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0f40638ba8a9ad…

MALICIOUS

PDF

49.0 KB Created: 2020-11-06 20:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 168ae012de6937778e08f54bd01b8e31 SHA-1: 5d0321131f71a0fe6216e4441d0f678964ef8960 SHA-256: 8a0f40638ba8a9ada7ba8c0bb512a910dc9c5c2119b717085bd45e0a2570b2be
96 Risk Score

Malware Insights

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

This PDF file contains a heuristic firing for a PDF link farm, indicating it's designed to host numerous external links. One prominent external URI, 'https://trafficel.ru/aws?keyword=anita+blake+wounded+read+online+free', appears to be a lure, potentially leading to further malicious content or a phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/aws?keyword=anita+blake+wounded+read+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f8fe164c4a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5f99a52789c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f982f292e305.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/1cb30897-7b7d-433d-a32f-97903fa86c0b/highmark_health_options_formulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0e390b-e9ab-4acb-a485-49c4b4c842b0/persona_4_margaret_social_link_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/impulse_momentum_and_collisions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baa55d4-1c22-474a-95e8-b6d52a964062/58841653575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e0d8f6-7bb7-475a-b9df-8a0b4bf7b65d/genixitizujorep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a730903c-30b1-47dd-bbcd-0f0f5d19cc87/30643633991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4e29da-2d8d-4a0b-9b16-d1311ce09429/vasapedebovupaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a8bd08-1801-4832-8464-ced112dd02f0/golomosedabezogudefiwuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f6572a-0869-4ef5-9ec3-a5c3325ffeae/50110091677.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/agricultural_marketing_problems_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0524ab18-94da-48db-8732-5000abfd458b/makimawukomusaji.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_off0000805b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 5008 bytes
SHA-256: a97d0ef1d8094ff6bbe481930c154d76af74b940e90ba6bd390e257f66545869
font_01_sfnt_off00009188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9188 10500 bytes
SHA-256: 07d008db303525f99842011c3eb8602769b4678d237ccb4dd6d9e22505483447

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