Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dccc05635a1633c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 13:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74f722b939a7acb0d758cd8aedc6a16c SHA-1: 2bf09124ad37afed484fde54bd86b04f94a0cd60 SHA-256: 8dccc05635a1633c5613961c8f16c8a7457a7ed06b3028633d6eed1107a6b144
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 embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=solari+udine+dator+6041+manuale PDF link annotation
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/36606160824.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/wevowubanoxisuzi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nesiwibesoj.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/83272150726.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xerazedenanozasefu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/porufogovux.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/34288180653.pdfIn PDF document text
    • https://langumeistras.lt/i/File/80732051393.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/91836742956.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zukulowedesakeserumikeg.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428085127140.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210525183148.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/61081716941.pdfIn PDF document text
    • https://hirurgija.me//files/varukes.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/43784065349.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/35704060872.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c16d0fddf---vovusuxanod.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r32in4275mu4ih31c5062qv2or/mebadi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/94379467382.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wikipuludogezuvuwevurili.pdfIn PDF document text
    • https://olterus.com/contents/files/43608620504.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://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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 18660 bytes
SHA-256: 6bfbb855c3ca4148aac75908eae1c6df655984b243eb1952df6bc0b398e4af04
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 10836 bytes
SHA-256: 27449b742e4ae398291c72b476c1aec27f4a56f94a0d6d0f1e97170bfd9393c2

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