Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a3d81fc34b38dc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 09:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6e4bc806cfae4b01fc1cf7b3872f738 SHA-1: 1f2841276ae1542ca205d8eab50451f5cbbe8eb9 SHA-256: c3a3d81fc34b38dc015ed17a80fa3b71b49d471f7e8bc02e8dcf7d91b742e45d
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 for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into visiting malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.cavice.fi/tiedostot/files/48344678275.pdf
    • https://vsevolozhsk.mebel18.com/uploads/files/sivilovokoralugulinir.pdf
    • http://sokole-tps.pl/userfiles/file/mivolunosinajiruvofi.pdf
    • http://thuexe7cho.vn/upload/files/57947175346.pdf
    • http://bogaarchitetti.it/userfiles/files/43701697305.pdf
    • http://chono.mn/uploads/userfiles/files/zofetagumavinulit.pdf
    • https://unibel.pl/pliki/upload/file/dafitefani.pdf
    • http://agierresrl.it/userfiles/files/54213455771.pdf
    • http://msdoubrava.cz/foto/images/file/55557367837.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/tulonepavupixufajo.pdf
    • https://shreegroupco.com/userfiles/file/6016322640.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210903_014654.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/5113512711.pdf
    • https://ceccarbotosani.ro/userfiles/file/1879801565.pdf
    • https://malashealthcare.com/userfiles/files/80848372726.pdf
    • http://energyexcess.com/userfiles/file/nanemelategelanapabax.pdf
    • http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/50087033922.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/zedabosejakowoguleverixas.pdf
    • http://rayer.cn/d/files/rubekafilenanon.pdf
    • https://clinicscrm.com/img/files/wixubovetawonifemem.pdf
    • https://rewaqousha.net/userfiles/files/giwuvunudazobifovovo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=crack+after+effects+cs6+64+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c120.bin
65ac657cfc8db2d6d782e12ffa88d274861d873324e883db9ea98b30476c3296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC120 16744 bytes
font_01_sfnt_off0000ec7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
font_02_sfnt_off00010496.bin
a39368de12440c80690e906d81892c578db04287ebbbf3540796d62b2dcd4ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10568 bytes

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