Malicious PDF — malware analysis report

Static analysis result for SHA-256 065b24434f535fbd…

MALICIOUS

PDF

40.3 KB Created: 2020-11-09 08:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 369e0a86d4e506bdccb28494c3c20669 SHA-1: a5744a7314a162a26cd694571561e1b5c4979ed6 SHA-256: 065b24434f535fbd25e4defb206476270bbbd28e9cd8d6bee7658f5d8ae33e50
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. One of the primary URLs, 'https://traffset.ru/123?keyword=mad+steve+the+drummer', is identified as an external URI and is likely the intended destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable domains, suggesting a deceptive purpose. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly suggest a malicious intent to redirect the user.

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=mad+steve+the+drummer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8d21ed448fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_5f9dd1b41367d.pdfIn PDF document text
    • https://xidogofu.weebly.com/uploads/1/3/4/3/134307260/3558827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f986069a7694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/new_balance_mx608v4_mens_training_shoes.pdfIn PDF document text
    • https://tilemidif.files.wordpress.com/2020/11/28127747322.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://tidesefotiku.files.wordpress.com/2020/11/julotupap.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/free_cities_preg_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/osrs_fremennik_isles_quest_guide.pdfIn PDF document text
    • https://falikajudepi.files.wordpress.com/2020/11/fulalevazozoronewekunirux.pdfIn PDF document text
    • https://fofubebodowi.files.wordpress.com/2020/11/78368643179.pdfIn PDF document text
    • https://zegimok.files.wordpress.com/2020/11/20742094186.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_off00006084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5096 bytes
SHA-256: bc23ab283f640bdae9e75608f0adafdf305ca9aad5aacded6c536c98c373eb49
font_01_sfnt_off000071c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 10324 bytes
SHA-256: 22fbcd0b41b881d19430bb2c716e35e61a887b0d19b82f0bc6ee6b2dab5dc6d1

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