Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d379daf5d91e21…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 13:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b3936604874107a448c342cda6b137a SHA-1: f3c9e9debd48cc773b619324c382c8725394f3c6 SHA-256: e1d379daf5d91e215de796394a647acf8aff02eaa029c8ef40c02aaf2de09551
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing strongly support this attack pattern. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=old+man+and+the+sea+summary+pdf PDF link annotation
    • http://www.adarshvidhyasankul.org/userfilesfile/77904710295.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/womudira.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/bedanefeno.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/16308779309.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/goxikenem.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ae5ca31---wizav.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/xavazawevelijaloxumajiw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f755e8a---47523980514.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/11366388861.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/leratarafe.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/firetasoje.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/80113170173.pdfIn PDF document text
    • http://stringladies.cz/userfiles/webidiwonujedoworuzumu.pdfIn PDF document text
    • http://keyday.ru/files/files/siduvatadiragawowev.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/mukefopevefobuze.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/66326377682.pdfIn PDF document text
    • https://digireg.at/upload/138805982.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/97984543096.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/dumatekuxuzitibagoditi.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613c392b25a16.pdfIn PDF document text
    • http://saint-party.com/media/file/kukuzesavafakexa.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/53897003825.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/3489563797.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_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16552 bytes
SHA-256: edc8283d490c23568a686c1f37f7955fa9a1a6b0223fae9d6038782d1338c930
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 10788 bytes
SHA-256: 1311cffe4ba92f2f506cdfc27f13f39d932d487f968344d337aaef6417493561

Open this report in the interactive analyzer, or submit your own file for analysis.