Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e5a98fdea60bbc…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 17:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bca0952fbd47626d8f78d5106fd217d SHA-1: d88a3ecbc811d9bc9b832866f85f136ff86dbf6e SHA-256: 33e5a98fdea60bbc01066d50a2c4e4ff87aa0f44267e79bbb48184adcadbc930
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF link farm', with one prominent URL being https://seumenha.ru/wix?keyword=dire+lion+dnd+3.5. This suggests a phishing or SEO abuse attack pattern. While no scripts were explicitly extracted, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://seumenha.ru/wix?keyword=dire+lion+dnd+3.5
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6052e840d4001.pdf
    • https://cdn-cms.f-static.net/uploads/4470683/normal_6051cd3ab1178.pdf
    • http://natorg.fun/translucent_paper_sheetsw0uz4.pdf
    • https://static.s123-cdn-static.com/uploads/4491445/normal_5fce376de764b.pdf
    • https://cdn-cms.f-static.net/uploads/4373016/normal_601acf8145ede.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_60532abc65768.pdf
    • https://static.s123-cdn-static.com/uploads/4403537/normal_60088d28d66b8.pdf
    • https://cdn-cms.f-static.net/uploads/4444852/normal_6012658e9e84c.pdf
    • https://cdn-cms.f-static.net/uploads/4450734/normal_600c53527bd07.pdf
    • https://static.s123-cdn-static.com/uploads/4404966/normal_6006528333926.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6022361dc7f21.pdf
    • http://all-host.site/678345124084hrzu.pdf
    • http://speak4pro.com/norcold_n611_replacement_refrigerator1msi9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/musokejixami/laxabure.pdf
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_31dcc1cd8f1f409ebbd46280ce460fad.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_85a51b127ee04eb886047e587425621c.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/receptor_brasilsat_digital_plus_s2200_manual.pdf
    • https://s3.amazonaws.com/bejikefowu/64666915737.pdf
    • https://s3.amazonaws.com/sefepugolupalax/how_long_charge_beats_solo_3.pdf
    • https://s3.amazonaws.com/rutufokedizon/bsc_nursing_rajasthan_form_date_2018.pdf
    • https://s3.amazonaws.com/jakujakula/tonidusitidajosirakoxik.pdf
    • https://s3.amazonaws.com/sixenogafopoj/supovimilirenokiwidoj.pdf
    • https://s3.amazonaws.com/bolovopizonuki/jedizulifowuxevefe.pdf
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d3ca7c5e42954f90b2105050f4038664.pdf?index=true
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_01d2a5e0883d42eda31b106eaea8867d.pdf?index=true
    • https://s3.amazonaws.com/naxizugenabi/angry_birds_2_game_hack.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_off0000f9c3.bin
2cc349359c5b31b1ba2a35e931e507ec2c0c4dd3fc8447e400e68d1aec9771ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 4752 bytes
font_01_sfnt_off00010a09.bin
90fb6cf77374bfe326acdc7c7a45e28c3dd6916acb8a9365f7da34ed7b1d9340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 11312 bytes

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