Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0404b0ab68dce9…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 07:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d62ae5a512e737aeb793ae8c5d2f5181 SHA-1: 10b9398274eebcde6b472d4eb87f818d652b06b2 SHA-256: fc0404b0ab68dce9513c0defeccee5d16b95f8bc2e81ed2e98cb1ba6e4ff0564
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 and an ML classifier indicating maliciousness. The presence of numerous external URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

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 https://nomylo.ru/uplcv?utm_term=icons+on+top+of+android+screen PDF link annotation
    • https://mikludava.lt/images/files/tadefowaribojesu.pdfIn PDF document text
    • http://orthodoxnews.us/file/58544165859.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nozisuregu.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/moxoled.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/93687228586.pdfIn PDF document text
    • http://irollee.com/userfiles/file/37365172413.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/lujoganenamejexire.pdfIn PDF document text
    • https://buka.ru/sadm_files/26505325910.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jiniladed.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/26402374906.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lijaloretulajivegi.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/giwiwesakoximiladunijo.pdfIn PDF document text
    • http://tochalco.com/uploads/files/tonexekidejugoje.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/dufibejuv.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/sidaxeleradotipobujerula.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/godonowaruk.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109090920151840.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/65069684160.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/1615509981.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408d0d18b01---tewodadaw.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/nuluxuju.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/liwowipijexuredev.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/pasoritokilanutakasuno.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/75881503911.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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 15716 bytes
SHA-256: f8ab15e00e8c5bafe1265166bc375b1b29a9123e6a471245e75891b945f63de6
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 10516 bytes
SHA-256: fb5a96e2ddfc1c66bf4a5af3adc35c62955c8ccd24b4897de847091b86e67598
font_02_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1