Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a122d97040b2c2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 09:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2d13bbddfa57fa38de7b178831a5e0c SHA-1: a2da51b3dd241e7eedcf6d7df54c1bd72bc0b9b3 SHA-256: 74a122d97040b2c23650fb1715882a533fe928cbb1fb5bd50001cfdc4a5c0694
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'. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sweet-sugar.de/images/uploadedimages/file/88770413895.pdf In PDF document text
    • http://orthopediedelft.eu/files/xumedojojakuxivolebamo.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/65815608538.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d520142709---33403132043.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/rapagudelamoz.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109040651362790.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/63168101108.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/farujenovimolebevokope.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143530adc3e3---87442500152.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/48321343135.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/57434765349.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/rezipataxuvumigufivisarex.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/64753337800.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/gulizozo.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/8493110783.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/tisidaluzixeb.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090110074613802.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/15703360126.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/49451116009.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/dewofamikowowowogawonazoz.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/zidisan.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jozikupakasusepigabasejom.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/12762577995.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fubagexemat.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/68848185760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=just+cause+4PDF 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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 17536 bytes
SHA-256: c938869d39d9df8e14af22c9cd85c5068a5b0f90649e8f0519717d8f9d9c32eb
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 9932 bytes
SHA-256: 4a1bc3f58d0438f347a6d65d12003fdbcd2a59e3332387af4f185ae329f3c649