Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc5d0d1a8f09077…

MALICIOUS

PDF

49.7 KB Created: 2020-11-08 16:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cb44963ebcaa177479b5d9a85f1f0b2f SHA-1: dc4e2867d2042f909c7761991bae13fd85f0c21a SHA-256: 0dc5d0d1a8f0907753c547aab7a6459e3d9415fb5acce47f171af4c8ae4ad394
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The primary URL observed is https://traffset.ru/123?keyword=xylophone+songs+notes, which is likely part of a malicious campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=xylophone+songs+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5f961b4d95768.pdfIn PDF document text
    • https://kidudowo.weebly.com/uploads/1/3/4/3/134318554/1508359.pdfIn PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/9d0cb61477d9.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/4124708.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://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://losorul.files.wordpress.com/2020/11/54796922724.pdfIn PDF document text
    • https://dogimevunij.files.wordpress.com/2020/11/68549314887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8ffdb0-a1e3-4df1-9ca2-e5b74f2d56fc/competitive_success_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb35504f-ea03-4ff1-9816-c3eb1d86d41d/wawupovaxet.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/agenda_for_a_meeting.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 4592 bytes
SHA-256: f7f5f082f55e45c77bfa02a22ace3b4f9059e56e4f5443b73b2c0aecfa1ca727
font_01_sfnt_off000085e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E7 10924 bytes
SHA-256: 4604ac85557c59003c6e3d86a845b9c9e010c0137956b2b5a320c84b9b6f6554
font_02_sfnt_off0000aadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAADD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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