Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2defc1c01e99626…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87fa3b08c33d1dded891860742567a6a SHA-1: c9bfe438636dc7b555c7e846b980212d00bd60b9 SHA-256: f2defc1c01e996268791e81bf0e1f77bca272beb62bd6043a16da62aac7dab1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While 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 0.9956

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://theponghop.com/upload/files/80455975335.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///zolofemikeliwasisen.pdfIn PDF document text
    • http://sinostandards.net/upload/files/58334464589.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913235051.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/junugovi.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nudebowuletukizubevo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c153483a9e---55831383201.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/70415836912.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145413b52518---91162470776.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/19876700175.pdfIn PDF document text
    • http://ndt-ultratech.com/files/64368541129.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/95465700384.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/37650896397.pdfIn PDF document text
    • http://indemo.pl/Image/files/tuxivalusixelavow.pdfIn PDF document text
    • http://raczcsalad.hu/files/lamizifabofanizuv.pdfIn PDF document text
    • https://atavio.ru/files/file/72739474210.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/19672980663.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/giditodogonisisaju.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/nekoveme.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210905_9515D478BAF01C52.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/rikebilesujus.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87825671652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=60fps+video+player+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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 17856 bytes
SHA-256: ca0a8df1f645d92ab058e3bca2d37361968b25483419f5fcce09132d27bbbdd1
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10764 bytes
SHA-256: d82e288eb921e508a0df460bf9a6bc4837f21e131dc8de0bc466944732400e91
font_02_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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