Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5be60211043f6ec…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 00:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fdd78e3799e3e7098764fcf14da53b3d SHA-1: a68364135402c0496551468d3ecf1d1e6dfc682a SHA-256: c5be60211043f6ecce955722e887302e32a2fea1ba52329b39d520f4a593f861
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The document contains a large number of embedded URLs pointing to various domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic of using disposable hosting for numerous links.

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://baarspo.ru/123?utm_term=what+is+another+word+for+touchy+subject PDF link annotation
    • http://stylecurtains.com/installing_sunsetter_awnings3r3nw.pdfIn PDF document text
    • http://5-euro.info/zalorisunasepubug3ijk6.pdfIn PDF document text
    • http://sovetnik53.ru/davinci_resolve_14_manuale_italianoymfuw.pdfIn PDF document text
    • http://grinallex.shop/fefinelovutevejuzomogjhk16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_602e36769903a.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/1756_enbt_firmware_upgradevcqrj.pdfIn PDF document text
    • http://bathforlegs.xyz/neoclassicism_architecture8t9av.pdfIn PDF document text
    • http://c-advance.space/guidelines_for_diabetes_2019wmbre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_600b11a727e97.pdfIn PDF document text
    • http://indir-kazan.com/wupogironewnfi80.pdfIn PDF document text
    • http://arm-watch3.club/96237548252z5p06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_602107a203b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fe74fdb7a3f8.pdfIn PDF document text
    • http://brumbum2.xyz/intex_633t_parts2yetp.pdfIn PDF document text
    • http://montana-media.com/nesororamuxedagirug0o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fc8ff009efed.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 5384 bytes
SHA-256: 14991cc66a3127531ee1b929059c2f92b3ac0553f8be8655a3a50a582b61febf
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 11392 bytes
SHA-256: df33ee4a6901c2d40fc11cfdd05bfd70f587d94ee9f643832d2bef4a1f945ae7
font_02_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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