Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b75f076a3784727…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 14:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 035d427f49f5e53109bb8185125ae367 SHA-1: 688736c7c9452f7c4a33c06f49fa414640602de2 SHA-256: 7b75f076a3784727f7cd1c9bf9efcafe49bbeab95fc62b801cf579425db85bb8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, and is flagged as a link farm. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5732

Heuristics 4

  • 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
  • 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://aptwash.com/userData/ebizro_board/file/limawupa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e2ca5ed6---kijolezolaxibumenepogem.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/bemexamokovomisor.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/nuxujifilodexokoxe.pdf
    • https://egokituz.org/files/galeria/files/19984274721.pdf
    • http://eapver.com/upload/ckimg/files/202109170015035054.pdf
    • http://betonkeritesek.eu/Content/files/21777408878.pdf
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdf
    • http://rideco.hu/upload/file/86667396512.pdf
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdf
    • http://dkind.net/userData/board/file/penezumitovelavemefe.pdf
    • http://ceomit.com/fckupload/file/siguliwasas.pdf
    • http://insuralead.com/userfiles/file/tasoja.pdf
    • https://efnnma.org/files/file/16424187965.pdf
    • http://amphorabeautyclub.com/campannas/file/52874701283.pdf
    • http://abwpetersburg.com/uploads/files/wavixewaloronufuzu.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28491108091.pdf
    • https://laurallo.com/ckfinder/userfiles/files/xubanimorule.pdf
    • http://dermalab.pl/userfiles/file/61335491295.pdf
    • http://abwwilson.com/uploads/files/mefodusidelezijelolidokem.pdf
    • https://widepolymers.com/userfiles/file/bofixonubomurigu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fun+minecraft+things+to+do+with+friends
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b6.bin
ec7ad838022cf652ce2fcb93054ccf1a36d50b13e55598d8d3330d9e4cd6485c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 11040 bytes
font_01_sfnt_off0001000c.bin
0781763c57741538e59689ed33d16937ccf87c6c9c1edbf443921ad0330f89fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16984 bytes