Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e390b5ed8e7f4d2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: ea259370d6920e5a746d385fc14c39a9 SHA-1: b3f9d1dbfdadb0125c832850ee20dc6000097afd SHA-256: 8e390b5ed8e7f4d287e6515e1ec84e794c8f7f4b3ab4f80659c1f6820b5ff7c4
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://infrive.ru/uplcv?utm_term=tundra+location+map PDF link annotation
    • http://prochem.vn/images/uploads/files/narorixasinosavokopom.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/48025608504.pdfIn PDF document text
    • http://agilesolutions.in/uploads/76158643982.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392320c224a---55381271786.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/94780834397.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/63085070824.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/86222784909.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0953f1bf---lebulikukukope.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/xodezojanibixepumu.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210911_39FB7BF65E5F1000.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/66800743456.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/30119857080.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/4749201152.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/feraki.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/53934477674.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fifipebub.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/15296450487.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/78221994911.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/55265092969.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/tofimifagifuz.pdfIn PDF document text
    • https://aashianarealty.com/file/rugonutozup.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/39494762691.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/pugifuzesurabebafuj.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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 10436 bytes
SHA-256: d8a6157ac944978e913eee451b4c37bf6f6605676dfccf7655e706fe09cf1c1c
font_01_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16900 bytes
SHA-256: cd2a4555f8d1e66453576fda5ac028d6e903eacae53f9cc9c4d453890582334d
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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