Malicious PDF — malware analysis report

Static analysis result for SHA-256 083cc40ccbc85fbb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 09:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b838d4df7ba091ef58e0b39b6b092c7 SHA-1: c60789ff65e99eb093c84d08a4f0b6c1f34812da SHA-256: 083cc40ccbc85fbbafaa28e765f8d0f01f95fc204b39186d9d2553b6cbff5bf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--lenachatka-57b.pl/uploaded/file/57660530271.pdf In PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/2424555744.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/latomovobelegofabira.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/26579917683.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/suwibumeni.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///31045936773.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/popijanufavewadifug.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wiwomukuti.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210912014138.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/19699502462.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/25700606922.pdfIn PDF document text
    • https://kapefashion.com/files/files/45080571190.pdfIn PDF document text
    • http://rentaruedas.com/files/others/ludigotegapud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tear+of+the+goddess+pentakillPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA84 17712 bytes
SHA-256: bb6fcec4f4fc7cd9e413c9013271a9884733ed45d9503244df9856f4af4fb832
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 10832 bytes
SHA-256: 463a5b5eb657830112ae75e0a86c952662c11d436857160e8c0f9d832b39d54d
font_02_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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