Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ce76028db4ba1f…

MALICIOUS

PDF

65.5 KB Created: 2021-04-30 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e14d7a2d6a71d680c781900c517df16 SHA-1: 626dcaa4d3f20d72cf39e72fd2f94ad00178bc24 SHA-256: a6ce76028db4ba1fe10cf3355581c597c9f397dea0e09fb0966046522dba0e54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=lincoln+electric+wire+feed+welder+weld+pak+hd
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/vutixilabisuxef.pdf
    • http://guromufupadaf.iblogger.org/what_is_the_tone_of_the_song_anak_by_freddie_aguilar.pdf
    • http://tifimazupidad.iblogger.org/1663108119.pdf
    • http://nolaxevoxuvelij.iblogger.org/dubai_airshow_2019_manual.pdf
    • http://qrastenmap.online/friends_like_these_star_wars_rpgqljry.pdf
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/diwasikemewibabex.pdf
    • http://wide-mean.top/fepaxepn2len.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_e25df4f291e1445b97b4892dd6615970.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc0b3f59-a81a-4022-9334-c15f14a5bfda/46805703602.pdf
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_e3a827f584f643b78a58ec39511cb193.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_8e5f38e347ca476ba990fdaabc593abf.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_11314e7fdfaf4f75a6582fe314625f77.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9500a27-79a3-46fb-a686-6118c86ac18d/37688835214.pdf
    • https://uploads.strikinglycdn.com/files/c9b3af78-3728-490b-b241-245ec19a5314/accounting_for_dummies.pdf
    • http://govepagigugig.rf.gd/kezove.pdf
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_7ea03455539d457fb8bc28b54cb00f59.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_286c20be9e43429cbb2ffa7eede9fef1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9a39f1ef-2949-4891-9f78-dd6bea3c3b5c/sapekudaferofi.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_03a86c7e8eb94c03a9dd94026e2b04ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f96cc52-ec8b-4006-b140-8adb8a7b713d/vaxefobip.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee8.bin
f926c6344c3ed926c4a633e81c2c628074748d94706708fd102042d7aa7f2253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 5164 bytes
font_01_sfnt_off0000e08b.bin
4d6f970b81e6c71ba835f592478c61a28f3c7973a778f59485c08c29d9b5a968		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10688 bytes

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