Malicious PDF — malware analysis report

Static analysis result for SHA-256 201d4cc08b24f5e3…

MALICIOUS

PDF

71.2 KB Created: 2021-01-15 20:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2d520d6b65ace3c73fee696000407aa6 SHA-1: 2b7996363858f188b6a421fbd08f84c4e26ff9fd SHA-256: 201d4cc08b24f5e3f86f6bd82688761df6ca6cb778b87f94dc18d22c9448dd93
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, many pointing to disposable hosting services, and one prominent URL that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'Riu agents partner club' and 'wkhtmltopdf', suggesting a potential lure or context for the malicious links. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

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 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://traffnew.ru/123?utm_term=riu+agents+partner+club PDF link annotation
    • https://cdn.sqhk.co/bojojiweg/fQPigJB/loxibutew.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/715f700.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/5898509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5f991b377be61.pdfIn PDF document text
    • https://sikiwakasizo.weebly.com/uploads/1/3/5/3/135318116/f8bd070e624a9.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/vudamamis-simitolabig-rubatajinem.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/6467567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f8c03d091cee.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/a688740bc.pdfIn PDF document text
    • https://bujubilefo.weebly.com/uploads/1/3/1/4/131406518/tedirunawafitiviji.pdfIn PDF document text
    • https://fifiruzi.weebly.com/uploads/1/3/0/7/130775727/ff4860b428.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/vatosolikijike/74110643632.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 5248 bytes
SHA-256: 37775bb45fd1d82d5470749d512f1be11d1797cacb7a0fd42cd1631367a1c0fc
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 11060 bytes
SHA-256: 906e67aae7584d4948e22c37bbd0ac9b583f49aad150e77fe94f9f018d86219b

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