Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd8707994937334…

MALICIOUS

PDF

73.3 KB Created: 2021-09-29 13:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d9dddce86fb369bf6f5c52b7739b9ec SHA-1: b2bfb0ac56f7b670370e714ec37232999f6eb963 SHA-256: 7dd8707994937334d9ebdc9372878db5e846344d46797ea1ee5ab4684e5874bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shreenatharcade.com/userfiles/file/70459465984.pdf In PDF document text
    • http://indigobaby.eu/upload/files/19823877282.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/wenodixodamizugagozebog.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/88265283625.pdfIn PDF document text
    • http://maxbrio.kr/files/files/37900837135.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/zeroxobitamagikemu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/082bef20832ae669c49f20d0535e17b8/nokolajogir.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zopatisoroxikejexojukutu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/99258845300.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210921021424.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/32478264020.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/88236656283.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/lupujomusibuvokavuzugewi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/tipibav.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/fogonarobomisolunen.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021092900515050.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/63990745299.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/74766398774.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/vikowifazegulusajagev.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/2483221379.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/60214341035.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/95035976891.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/jadisafaruxozuxazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mazmur+dan+nyanyian+rohani+pdfPDF 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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 10588 bytes
SHA-256: 14f0da73729889ac7ba35cbf9740501b462b61db95f4c4ec4f8bdda06ad61b79
font_02_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 19068 bytes
SHA-256: ad0b087ffcfb1786e05927dfa504b94000ed7c758162d82edb296957d5209e83

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