Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef7d2537f2ffe4a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d4fff2b35753be36d0deae97cdd1eab SHA-1: 489b1052a2dea70016b25eddcc5dbc74efb1992c SHA-256: 6ef7d2537f2ffe4abe80ef6b1755d01237aa854a38996cceb215257c3073416f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://condominiobrisasdelnorte.com/userfiles/file/gogevatupozixilisutoza.pdf In PDF document text
    • http://rajhansnursery.com/userfiles/file/mojabi.pdfIn PDF document text
    • https://fuoriscena.eu/file/ranuzesovatusodemav.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3c7429a---65406030709.pdfIn PDF document text
    • http://pileki.com/imgup/file/10849876106.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/96636369327.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/66164387582.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/dulakiwezelafuzi.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907113354.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909231202.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/tilunaxoxij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13513cbd2---vekejojawunozibideru.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/xikewifovojewaselutegerup.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/gimonolasuregadebazerasog.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/fekatodezagipozuvesezevu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/rivozeg.pdfIn PDF document text
    • https://turbooto.vn/upload/files/jijejetafuturefugunew.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/99514600693.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mupefa.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jonokanezipakapetabinimuk.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/54072999294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vlogit+app+download+for+androidPDF 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_off0000b8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DD 16940 bytes
SHA-256: 15f2a146e2df406abbda27ecec3b9a93ff08af92a1f8204fc85e8d431a0f1ea3
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10428 bytes
SHA-256: d691042ffb77e15c3cca1c23480988f74f13e91f21df0dff0d9241a6b76f898b

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