Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c408765fcff248…

MALICIOUS

PDF

101.3 KB Created: 2021-04-04 22:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a266907fca95bb50a0e67b6af60aa725 SHA-1: 164045afa76e8d4dc951d7531b46fa53ffaade4b SHA-256: a2c408765fcff2487e8d7485930b9dd53c09c2b4ff6d93d7b685fe242a9eefae
156 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 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 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=the+heirs+bande+annonce+vf PDF link annotation
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/gelifot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fdbfbec7607b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_600b4727d0e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_600de972885aa.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/dQfichh/prepper_food_list.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/wajilogugakegamemeke.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/ijDjgF8/chess_3d_game_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_60611647acc27.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/8747642.pdfIn PDF document text
    • https://cdn.sqhk.co/kevemelis/dgiChcM/24764796298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_6058b4ac8762a.pdfIn PDF document text
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/sosolibetut-vomosaronu-paxibovijujuvi-marutina.pdfIn PDF document text
    • https://cdn.sqhk.co/komilede/erGcp6f/fopisuwomofojif.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/geicidI/hurt_the_hangover_3_soundtrack.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/nawuvud/64931221546.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/auto_format_in_oracle_sql_developer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 22924 bytes
SHA-256: 9a602b40f88349c08c1f80d83c2d6cf37a8282d4e62b926393e2722fb39798e4
font_01_sfnt_off00014b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B95 5224 bytes
SHA-256: eefe272cc8f9f9285e221f5b57a338150cb71b5f2646315958d3062e14678c64
font_02_sfnt_off00015d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D59 12708 bytes
SHA-256: 084e3f362fc63f2d5a14a4b599d074464d39632fe9e24e3a25dd1526f53f3213

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