Malicious PDF — malware analysis report

Static analysis result for SHA-256 be76d5ed4ce6f223…

MALICIOUS

PDF

68.3 KB Created: 2021-01-15 05:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b3d47f87e6b3df8d69c74158b2a89c51 SHA-1: 18870ea41d52da5085be70de08c3547c9b433a52 SHA-256: be76d5ed4ce6f2233963ed7427a3b472333c9db28f551e8acd2e6f038091243f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=hungry+shark+evolution+mod+apk+android+oyun+club PDF link annotation
    • https://cdn.sqhk.co/suxupijisajo/A9heEie/soxuvefanoxevisup.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/hdsgghg/49136211139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fa0c3001d5f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408866/normal_5fcd3c3b9b22e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5fca40210c47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_5f9ca64fd82ba.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/kmhfghT/skill_roller_ball_game_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fbb423e2f26a.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/rabonebuditar.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/ijjiihd/defend_the_bunker_2_apk_download.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/zetare/zovone.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/komori-san_wa_kotowarenai_anime.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/5920503429.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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 5816 bytes
SHA-256: 9bb6969def496a52fc0a6aabda6763d06571f7cf82e234a6abcd200d28b9652a
font_01_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 9908 bytes
SHA-256: d2bbe84fed7a44e806c172ba940025ecc8df13f1c5bb77d1a66a4dc008ca5f60

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