Malicious PDF — malware analysis report

Static analysis result for SHA-256 f674bf827b5e8cad…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 08:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c37326e5fdee41b5d35bd6bac711880 SHA-1: e6059c85d48f3028196de1ed195605dc59c4582d SHA-256: f674bf827b5e8cadcc06ade18139afd883cf9cf81d88e2798c8170a21a8702e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/aws?utm_term=teorema+da+bissetriz+interna+exercicios+pdf PDF link annotation
    • http://organic100.fun/food_expiration_dates_guidelines_chart4qvfg.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/bogujuveviva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_6020d2c743346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_601f249c7a801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_601de8451c3c4.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/matadujulax.pdfIn PDF document text
    • http://sputnews.com/crimson_peak_full_movie_in_tamil2c299.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/3731976.pdfIn PDF document text
    • https://towirakupafa.weebly.com/uploads/1/3/4/5/134595516/fubewexidido.pdfIn PDF document text
    • http://siankaanmexico.com/85366179160kxgfh.pdfIn PDF document text
    • http://formulamoney.top/school_girl_simulator_mod_apk_1._0_unlockedm3t3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://javasuk.epizy.com/80487945064.pdfIn PDF document text
    • http://pavinudoj.epizy.com/wosiloserinumof.pdfIn PDF document text
    • http://pebuvow.rf.gd/blackberry_10_autoloader.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 5264 bytes
SHA-256: a1e05677b84027db6ef3af57676ccd4497927204566f8ab9d3e0370c51758218
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 13160 bytes
SHA-256: 7755fca95c48ed33c491fd0abeef40b3c6fa7d7769c477e702b99c418caaa4d4
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2
font_03_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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