Malicious PDF — malware analysis report

Static analysis result for SHA-256 92642282c955f28b…

MALICIOUS

PDF

59.3 KB Created: 2020-11-01 20:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a235edb2cf0fb9b80cdae6a3d04dbc22 SHA-1: d4e3e5fb204547bf028987974c89a02c254ed978 SHA-256: 92642282c955f28bfb8caec26fa77207c5dd7b347a61f65b9907da01e62d0aa0
184 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=the+human+body+diagram In PDF document text
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/jawutev.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/lepafenirobizogusote.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/dugebugezuboduzo.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/sonetofiru.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/ccac4d1e4828f.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/b92c6.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/dokisujirifur.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/doliverepiginezag.pdfIn PDF document text
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/bolajafo_wavigewiraz_kefog_wetubefitubuzew.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/3efa02ca7f1a65.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/sovuzer.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/42cad94f-d131-425e-9376-7cda3296be0a/24231599840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba4cd79-df99-43f5-acf6-989c8bbd2729/17793171149.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/2184176892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b4e3f7-8b10-4ecc-b5b5-f1c8d29f9202/59285587436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87893971-31bd-4f3f-9593-6a169aa1b08e/65913469321.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_off000092be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BE 5220 bytes
SHA-256: 900e12fed699c8c16f1a314bc14899378c44471ea5ee258e94fdbf115a3bb3a6
font_01_sfnt_off0000a458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA458 11000 bytes
SHA-256: 9c216349a111d2a1efadbb7c7bfce66d8242a23d0c7f8e72de2a312e79ab03f4
font_02_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 16364 bytes
SHA-256: d8355cbf405975cff4d46221b0a31a64495b6350531b373b5b930ebe70c69939

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