Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc85f54df5e2ddc…

MALICIOUS

PDF

50.2 KB Created: 2020-11-08 20:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2e3a6145b4e1be24e18f3763996651e4 SHA-1: e65e12e7d3a2d411ef9e51e2b98ef8d3c6d1b077 SHA-256: 2fc85f54df5e2ddca9889900e9910ed38d1d93b18d56cc78773c88828d144a60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to host external links, with a high ML classifier score for maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'glencoe physical science notebook answer key'. This suggests a phishing or SEO spam attack pattern where the user is tricked into clicking a link that leads to potentially harmful content.

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://trafficel.ru/123?keyword=glencoe+physical+science+notebook+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8beafcd3c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fa7cd92f34d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137f8d6b-cdd0-4f8a-9438-a2e382dfcd50/street_fighter_5_kage_vs_evil_ryu.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/andy_warhol_self-portrait_1986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9232041-9294-44f8-925f-5393832cf478/marlin_guide_gun.pdfIn PDF document text
    • https://nuzobelesuli.files.wordpress.com/2020/11/advanced_pixel_apocalypse_3_unblocke.pdfIn PDF document text
    • https://bisiguxul.files.wordpress.com/2020/11/persona_5_chanting_baboon.pdfIn PDF document text
    • https://lonofoxov.files.wordpress.com/2020/11/19943643404.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/59788050400.pdfIn PDF document text
    • https://gosotimej.files.wordpress.com/2020/11/gobuwagoze.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.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_off000081ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CE 5448 bytes
SHA-256: 0b7e00692d19cb73ccb782b50cb02e6f047e5da7249444442ef6d0665af8f665
font_01_sfnt_off0000946e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946E 11680 bytes
SHA-256: 256fcd91c6617a52c871deaa6ab0eaae6877154f367ba780a1232934dd99b689

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