Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf0d02c339c3778…

MALICIOUS

PDF

68.6 KB Created: 2021-04-30 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf9b267981c18cc9c1c0c490f2baf59 SHA-1: 47d417820a2922e3e0b09e1fc489fdea12b9bd5a SHA-256: bdf0d02c339c3778114727029cb739fec433a87d80e51b6a8926172727fccbb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one suspicious URL identified. Heuristics indicate a link farm and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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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