Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4f0332c1e3f050…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 19:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e841cb5aaa2c87bac82d8cdc7ba9f431 SHA-1: 557eeb111193d92bfd451c1059679524d12d9c59 SHA-256: cc4f0332c1e3f050f6ea29bdfbf1e35a820691e7f49795fdc24cbd5334e05bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rwdwebwebdesign.com/img-aim/files/79893234518.pdf In PDF document text
    • https://goodline.by/userfiles/file/851335416.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fitaxe.pdfIn PDF document text
    • http://konberdbio.com/upload/files/fogumopalemefevonu.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/rezobekejufute.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/20950929009.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/57922432082.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f07fa4257---jinoked.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mepare.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33618629169.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66762537330.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3a245f9dbc8f46a08e84d632fe6536ab/petewer.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/74982805939.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/75105331268.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/fodajenokefebazixidarifiv.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/60012288725.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/bujedagotukubizeguviwot.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/80001327159.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_002727.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/77919598195.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zibilirukexobizenojak.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_230809.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/16895022232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mitutoyo+dial+indicator+catalogue+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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10836 bytes
SHA-256: de1f1b0ac52ea5c50d24093da9b1654adb72f5147f8ba8b389a04759fec23214
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 19344 bytes
SHA-256: e1e5de8b0fbba05f53df4f370574e1d72b7629c23a5296fd90577bcffeb5f8e8

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