Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b3c989d535a931…

MALICIOUS

PDF

80.3 KB Created: 2021-02-22 22:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33956bb5dd68b116553fbf6b23c94bfe SHA-1: cb4c5b6d555a93324c0e8972ca2faf1dcec27e2e SHA-256: b4b3c989d535a931260165f3910777c7f5aaf328343c6a747c7ff844f9a38891
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are structured to appear as legitimate links, such as product pairing information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of numerous suspicious URLs suggests a redirection or download attempt.

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 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://jacksth.ru/123?utm_term=lg+aptx+bluetooth+headset+pairing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480895/normal_60062e34af07e.pdfIn PDF document text
    • http://usacreditcheck.info/5970188947unt3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6022517dba343.pdfIn PDF document text
    • http://myfirstsite.xyz/89227934776jdh1t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600e4e4a3ffe6.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/3c3d9d06d38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450733/normal_5fef88b06abd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5fc9b545b1d38.pdfIn PDF document text
    • http://snapchat-alert.com/15126633486e1d7l.pdfIn PDF document text
    • http://chaptejvxz.fun/schma_amplificateur_audioowib8.pdfIn PDF document text
    • https://bogagabav.weebly.com/uploads/1/3/5/3/135305267/popemox-burem.pdfIn PDF document text
    • http://supsun-aero.com/69191144666bv050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60184ee8abae0.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/9853505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 5372 bytes
SHA-256: b2a584b472d30890279970ea31b1c9c380ed323ef37f22f7d18f6856e24d3385
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 11712 bytes
SHA-256: 9167d0aca948f947734318eee6420e8fe822d5b278f3baa8e7de79c6556bcbb1

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