Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c35d18a2e22c04…

MALICIOUS

PDF

92.6 KB Created: 2021-03-15 14:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc014c0c3e65404c7a74a273607f2eed SHA-1: 45dd484ab4b6c8192b6d948aa914faad1760120b SHA-256: e8c35d18a2e22c04a0d149427e56a38c539694f2b6b64c012fa27d6cd4f6dc3e
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=small+pdf+to+excel+convertor
    • http://wetepuzasuvuroz.22web.org/descargar_bosquejos_biblicos_en.pdf
    • http://dogusiwimukames.iblogger.org/95829143461.pdf
    • http://jibuveborufo.iblogger.org/break_even_point_excel_template_free.pdf
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/7260263.pdf
    • https://bunekapizo.weebly.com/uploads/1/3/0/9/130969144/6911006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rutufokedizon/ecobee4_user_guide.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_21eb5482a94d456cbdefe5b9128490ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/161b4dc0-cac0-4daa-993f-4d5f3606fa41/94518823316.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_230fac17ef5c43c1b52a52055ebb0b49.pdf?index=true
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_01ac04bb0bf24e8697501f2c73ae27be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88c15734-0384-413f-83e3-6e34b94af0b9/72343736668.pdf
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_6592e954a3084f6b89e8ac6a30e183f9.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_88977486d4a148d3a7566c37fb68d0d2.pdf?index=true
    • https://s3.amazonaws.com/toliwudalamem/somojebirumijepulo.pdf
    • https://s3.amazonaws.com/sigobija/10931415324.pdf
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_520e68aa730144119a321ad599f374ae.pdf?index=true
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_252fe29711274d0382d0254a4788a910.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae2b3de7-2047-43ff-93a5-8dc3d68b7dfc/how_to_calculate_indifference_point.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa2.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 6744 bytes
font_01_sfnt_off00010087.bin
8b832c719965e2312a4d4df2ebd61e040e59e5291ab748f2b760c5880796e475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 5356 bytes
font_02_sfnt_off000112ae.bin
bc317423cc64512230fa08a25f3911c10b399a7a4ad4fc693c1910856ce05e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 14752 bytes
font_03_sfnt_off00013f21.bin
dace671bf050f77ab7f59f7d1b75bb54d3bc65509854aa5e40142fd7599ef1ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 10928 bytes

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