Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e058f56d89e95d5…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 09:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8b795543a76bf0d237219e641038c69 SHA-1: d6c9980fd5e2acd77fd4e1b0c5b3350781ec7602 SHA-256: 5e058f56d89e95d55a4aa59e0ccec6602f0cb79bb904bce271d4c734ed6c59f4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=acer+chromebook+15+walmart PDF link annotation
    • https://cdn.sqhk.co/gebitasixa/iaifi8t/cake_cooking_making_games.pdfIn PDF document text
    • http://redita.fun/57083113669ghymj.pdfIn PDF document text
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/dubevebizujiw.pdfIn PDF document text
    • http://leomannapov.com/55392407091gps5.pdfIn PDF document text
    • http://streamsweets.com/fupafosiduveddx7y.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hged4jc/hitman_2_movie_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/aifMJIp/rocketbook_panda_planner_app.pdfIn PDF document text
    • http://onlineeshop24.xyz/what_does_grade_12_or_equivalent_means3fjw.pdfIn PDF document text
    • https://cdn.sqhk.co/gugexuje/1jcwKge/gugozagupilas.pdfIn PDF document text
    • http://tesocoin.online/641944953956dd80.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/7TFggge/dofoligar.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/wupagosaseb_mutuzurafona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jetetejev.rf.gd/61213572976.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5320 bytes
SHA-256: f6b75b03b8a4e5be3718b588f5ab24f010a6bc7037a4abd65cc09ecc993ca943
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 10380 bytes
SHA-256: 9f72d9d6aea3e267fa441cc0ac9357c71d9d84d8642cada43171b223f153d96b

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