Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0f092397e368c6…

MALICIOUS

PDF

63.7 KB Created: 2020-12-28 05:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4599e692845403e539086d1c01a0ac2a SHA-1: 9a22591d895c2d9e0a6735e1d36357397b04213d SHA-256: 5a0f092397e368c65dee0b7471068a3e7bf0a4a0a0e7a851d98593a817bb496b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains a large number of external links, including one to 'siminanora.weebly.com/uploads/1/3/4/6/134611077/dosozug.pdf', suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=mystery+hostess+party+norwex PDF link annotation
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/dosozug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f92517d90212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fb5c2b3c947f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_5fa4828fa0f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_5fe808137d342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5f9385f610f88.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/fvCjeha/solitaire_card_games_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5fcfe81c17989.pdfIn PDF document text
    • https://zopugazuf.weebly.com/uploads/1/3/4/6/134658021/8653506.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/vobuturinivi/ancient_greek_civilization_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/weathering_with_you_eng_subtitle.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_off0000bef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF2 5144 bytes
SHA-256: e25a706cef097ad7eb0f7dac11d8dda2c6a7bb8230052c970fda459c3437d9c9
font_01_sfnt_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 9960 bytes
SHA-256: e565c818774340fb6f2981c7f18afc38c148ce854dff5ef194c489774a7e0cf0

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