Malicious PDF — malware analysis report

Static analysis result for SHA-256 c252c622230d0fbd…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 00:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffabe211edb3e68a7ab65ed7b1428d8c SHA-1: df170befb303892b76f61b2cd2181f9eb67be084 SHA-256: c252c622230d0fbd4c5a4d346f56ff69ad7bb0f0d0ff009be33613f5278f305a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs, such as 'https://jumiwimov.ru/wb?keyword=why%20is%20my%20cable%20box%20blinking', suggest a lure to trick users into visiting potentially harmful websites. The presence of external links and the ML detection strongly indicate a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/wb?keyword=why%20is%20my%20cable%20box%20blinking PDF link annotation
    • https://cdn.sqhk.co/nulaliki/gghgejg/kubicki_draper_jacksonville_florida.pdfIn PDF document text
    • http://walkover.me/liligegejisamigozozaditoxpz76p.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/iihejjc/highwaymen_movie_review.pdfIn PDF document text
    • https://lamerosezikane.weebly.com/uploads/1/3/1/4/131411411/40f29.pdfIn PDF document text
    • http://4bochki.ru/86702657928bes8t.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/Idnhbjb/11513274312.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/hhjhrGh/blundstone_boots_sale_mens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5fcdd0bbc16b9.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/XMiQwih/photo_collage_editor_app_download_for_android.pdfIn PDF document text
    • http://bonifacy.site/7440573320wom0u.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
    • 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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5504 bytes
SHA-256: 3ff241f82e0747e6c7b0fac32e329cf54daf4ed8cbebf37d4c240709770826ef
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 9780 bytes
SHA-256: bc354d702da10c324d86b3b84b84f861404244da128e5d75e516bfd805541404
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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