Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17aa42020094951…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 14:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b334c543cf686046db27049ea9c400a SHA-1: 2c069b1ef308f2f056686fc38fbc6e23e6582b69 SHA-256: d17aa420200949515d6ba8f3981bb9ab8febb4d879bad022e1a116565e7d0dc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest the document's primary purpose is to direct users to a collection of other files, potentially for malicious distribution or SEO poisoning. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fkjz.cn/upload/files/2021/09/202109130827352190.pdf In PDF document text
    • http://gemculture.com/userfiles/file/94956760887.pdfIn PDF document text
    • http://bluebossa.pl/files/file/70494599359.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/36070755598.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lapunewimawe.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fewuserinipovepotejini.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/sefesuperorovuvosa.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/muwomujejubobifajur.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tepebezosidasanofinixoxen.pdfIn PDF document text
    • http://industrialdevices.in/uploads/31717345915.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/rujigob.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/93115169742.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/88927025133.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nogiliwusoj.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/gozuluzadivipepudu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/46840838871.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/1584984974.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/gipisilojazirugilinukotug.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/dataniserobinagomijisokuz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bbb04437---tikekidajinogasij.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109150615408207.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jeroluxoxe.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xunatasepeg.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/3442099509.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916131103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=skyrim+no+stone+unturned+rewardPDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10828 bytes
SHA-256: 89331a526d16200bac0b6403d78f1277117063eb12852fa42007305d57795bfe
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 17664 bytes
SHA-256: 08f6ba3c0b960e61fadb8988bd4f024edf11ba8e5c1e4564bde2740799f94f47