Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce0137d4d0057e…

MALICIOUS

PDF

88.1 KB Created: 2021-10-13 06:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4416c51a96e722137d2895e736e0d190 SHA-1: 5c197cc8e38073bd89244d06430ece0e5cd1dff7 SHA-256: 82ce0137d4d0057ee5ebc864b98ee3c49db13cb27ad076f04f25572caa4ba9ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, many of which are unknown or potentially malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://greensquares.in/userfiles/file///53498308986.pdf In PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/80533227525.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/wusuxedig.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88351460712.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/bibeduwixevedibosilesaja.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/43382570391.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/tosewawalaxub.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/buxevewopufewomomip.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/mitibagomusubabulujologo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/22423607520.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/kobozozigejexurona.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/89982151285.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631055221.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5a00e4feff5344ef7151bb8128b47ff5/fogotarow.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/sodirapikedoneda.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/melilutezamanaz.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/45996904854.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/31360343083.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/nuzodita.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/122211039868.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/38327414119.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/xaduzivegawuxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=sports+betting+inPDF 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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 20244 bytes
SHA-256: f517bb06ecfc60a1d174d25aa3872b357277a0c3eb685ab3d02161dbff46f789
font_01_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 10432 bytes
SHA-256: 07fb9b8aef6cc86dfd3bbf16eed2f423e0578c7a31e1466907a7a35d2138e79c
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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