Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e2dcf15834dc8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be026cedbc4f266d3aaad060c2996769 SHA-1: 3e7e50b41020e6b42bd218907005f721679ff5e6 SHA-256: a93e2dcf15834dc89ca905b11794ab8b4d118db52ffb25abafc340645bb58c57
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a PDF link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to a network of potentially malicious sites. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a strategy to distribute content or phishing lures across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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
  • 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 http://jawarakreasi.com/file/linenigifexevutuvumegu.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/92527779784.pdf
    • https://etadelloro.it/images/file/61707727707.pdf
    • https://websbag.com/uploads/files/29180281093.pdf
    • https://ajansnigde.com/resimler/files/judodimirexomigo.pdf
    • http://pc-driver.ru/userfiles/files/53983981725.pdf
    • http://dsfly.com/uploads/files/3886601745.pdf
    • http://mishor-uvk.com/uploads/files/zesididutiwopiwopi.pdf
    • http://tsrmmessina.it/userfiles/files/zinavazufatolat.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/natuposev.pdf
    • http://centronegozi.com/public/leximalaxakogitolila.pdf
    • https://ijfbacknumber.com/editor_up/40549573892.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/18514790731.pdf
    • http://discus-rus.ru/upl/file/85868828013.pdf
    • http://vitacanes.com/uploads/files/mupituvebivo.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/xugadekonajep.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/derorusugonopal.pdf
    • http://vinmexindia.com/uploads/27165078461.pdf
    • http://mamaskitchenorder.com/uploads/files/75621191647.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351305cc7c7---kuvekumivagunavotigaz.pdf
    • http://indemo.pl/Image/files/55950581630.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210915_903B8B1C517C9CEE.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/41800307283.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rilisa.pdf
    • http://caffepontoni.com/uploads/file/gofisime.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=noise+app+for+android
    • 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_off0000ea7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 16792 bytes
font_01_sfnt_off00010291.bin
16269bf394f5226f9f2c2c5c768f14bbfd343c3c5bcdd20b1bec8f7f95c793d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 18056 bytes
font_02_sfnt_off0001318b.bin
3a337147c5e9415f7497462c4f4f1ef2ce45b29c9a99602d9988299e52b3675a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 10324 bytes

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