Malicious PDF — malware analysis report

Static analysis result for SHA-256 159cec3f3f2e9c08…

MALICIOUS

PDF

40.7 KB Created: 2020-11-05 17:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4792ec86bc7c2cce3055f3abce08906e SHA-1: de84ffad52ca1baa541a31b41b71e6523293a868 SHA-256: 159cec3f3f2e9c0856c574a9e01bde5e774d9639c865a0b00bbb93eb8baa99f7
66 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 1.0000

Heuristics 4

  • 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=module+3+earning+power+answer+key PDF link annotation
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/xuxomoloxub.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/15a8f9488c85.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/2f6d74fbad9638.pdfIn PDF document text
    • https://ropoxazuwaso.weebly.com/uploads/1/3/4/0/134040565/gakesibekav-bupomer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fa0cdb9b02f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5fa260d171fe0.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/7600545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8853b0637e6.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/zaresekagu_kiteruloru_ledurosesurolu.pdfIn PDF document text
    • https://jewuvasoseximu.weebly.com/uploads/1/3/4/3/134355154/lefixubo.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/e025fd99-a3b0-4cd1-89b2-4954ceb9f1f2/d16y8_engine_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91697425-5dad-455b-a9c2-26aae7e956cc/timiwamaxapedamiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdae206e-2cae-4444-aaab-ab357badcaf1/kukonunadujiwutufemu.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_off00005d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5C 5552 bytes
SHA-256: d6be4af0b02be256a8f90ddc31a203e3bf0fbadc131d2addd2d41b90dd8cbe3b
font_01_sfnt_off0000707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 10980 bytes
SHA-256: 8e9bb24b278e450492fbff5c5917ac9f8f2728b538767ae5bbe0cdaad03da967

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