Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af7caf59fa07f5c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 06:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd66b9726a21ef0226519a16674f5ab3 SHA-1: e9a42073efe2cfcf2d3c748837e1c2614f2b9ba6 SHA-256: 6af7caf59fa07f5c500e52951c23a40612ebc39a6be121260f7382f16c3dd6f4
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URIs pointing to external resources. Several heuristics indicate the PDF is designed to host many links, some pointing to raw IP addresses, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4320

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=play+store+beta+program PDF link annotation
    • http://www.impactit.in/ckfinder/userfiles/files/32475258094.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/49833121777.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/mazamogatebururosudazo.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_215444.pdfPDF link annotation
    • http://czernavendeghaz.hu/admin1/file/jawoler.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/56578697856.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/99943729001.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bavijokipi.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/wumidexaru.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/41647971163.pdfIn PDF document text
    • http://it-hair.com/userfiles/ruxusojobalogasozepit.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/63273474454.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613736292b0a0---5630835068.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/93225791107.pdfIn PDF document text
    • http://airmon.hu/images/files/nenasibeja.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/80054768778.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/robijabuwemuganaz.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nipimoxobex.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/46305888247.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/satikoxuwogexuxebozosaku.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83361067442.pdfIn 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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10652 bytes
SHA-256: 0b783967092a5ea1ad4072eb26527436ed5f29f9e47d12ddcfb47d7b05ca5a96
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 17776 bytes
SHA-256: 867dd2728536ba3a0e3f6e4ec3831af84e4fe5b83d899c039f38833faa56c137

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