Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c5fc259f161ac5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 20:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b93968ad5f66e7c578d0b73528eed9fe SHA-1: e1cc25599e8af5285922c2bb4cfa2736875ae244 SHA-256: 84c5fc259f161ac56b3adde9d96da30ba9b4304216e225044694f7be46ab0367
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=dragon+hunter+deck PDF link annotation
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/84394282660.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/34672777679.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141916eceb30---fixapo.pdfIn PDF document text
    • https://linardi.ru/files/file/fugojute.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/21379287392.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/lupobevilirotavixuso.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/34357719970.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.pdfIn PDF document text
    • http://greenld.com/userfiles/gulaniripu.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/46815535770.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d6452520a3bf0489223c18d6ee0f33d0/melitodomixinakozo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_0712ABC94F8E559F.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/batakobojisabam.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/86081814866.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/diguvise.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/reposinetefigevufugikar.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/najogixedulelozifofiz.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/99452873993.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/funuwazapagede.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vuratimo.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/26896929097.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_off0000af8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8D 10536 bytes
SHA-256: 28b8203b9133a23624cf9269422ae193b67b84a68ff8e5540d119f964ab84a56
font_01_sfnt_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 16916 bytes
SHA-256: 78b6ae7961755323f32e0569222d86657492180f8d99e62fef87b04b28b8efb9
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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