Malicious PDF — malware analysis report

Static analysis result for SHA-256 d698c34f43300774…

MALICIOUS

PDF

92.0 KB Created: 2021-05-31 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de9720823e87b19d40ec81b4fe3a0ef SHA-1: de2442863475e6bee9d42853525031a978484e20 SHA-256: d698c34f43300774cfe984f0f4f35f8f1db463561e1bbf1cedd012fa88dd6dd9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://xajibur.ru/123?utm_term=solubility+rules+worksheet+8.+2', is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=solubility+rules+worksheet+8.+2
    • https://cdn-cms.f-static.net/uploads/4451752/normal_605ee672c4ca8.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_605311e8ba8c1.pdf
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5fcd505165bd0.pdf
    • https://kiwepuzimogavuf.weebly.com/uploads/1/3/0/7/130776877/pesubalifa.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/5868a4342.pdf
    • https://cdn-cms.f-static.net/uploads/4422918/normal_603819a82b0ac.pdf
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/924a47b.pdf
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5ffad816e0619.pdf
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/tiwawasipu_fipoz_natetux_poraka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/274766c2-e06a-4de4-9439-8cd8c4a082fb/o_iluminado_filme_online_legendado.pdf
    • https://uploads.strikinglycdn.com/files/fc76781d-852e-472b-a435-21398ad8286d/xidejujetanupemudokog.pdf
    • https://uploads.strikinglycdn.com/files/2b436319-cd8d-43aa-84b0-c4288150f524/fizukopobafefajevokufoxex.pdf
    • https://uploads.strikinglycdn.com/files/84d83986-f268-404f-8a61-737d19d798b0/html_tutorial_for_beginners_in_hindi_full_course.pdf
    • https://uploads.strikinglycdn.com/files/6091e475-7438-4475-bc35-a9fd32abd7c9/bebinilexawowazi.pdf
    • https://uploads.strikinglycdn.com/files/0beff6f3-80bc-4486-9881-65b5ecbd903e/how_old_is_miles_morales_in_the_comics_now.pdf
    • https://uploads.strikinglycdn.com/files/67bac1bb-4b9e-435c-9bd2-17088dd5f1f4/pejafozu.pdf
    • https://uploads.strikinglycdn.com/files/5cad1ee9-d6b6-4529-b550-7ae3530e06dc/sivuvisodoniwupidopemire.pdf
    • https://uploads.strikinglycdn.com/files/0b4e6492-b90a-4d61-8ca5-d6e76dfe0c6c/31373059663.pdf
    • https://uploads.strikinglycdn.com/files/0fc0b303-d318-4e92-bb4f-b6c3d46f7953/regalilewo.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d8.bin
8f97787a98c1393565a74ecc7841718c6ce1318e2efe62e3dff35bae59e0a228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 6600 bytes
font_01_sfnt_off00010660.bin
50c757eb1bc00be5c2a0007cd583d935df4d70b7e827532bb8064b8fda56215f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 5420 bytes
font_02_sfnt_off000118e8.bin
7f6ec9ca05cdb32618fcd3fd187bbb20c179951fcd45cbc7cca9c27bcac9cf0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 14700 bytes
font_03_sfnt_off00014a5a.bin
f341d3167ed73cc0bae133af45eb8419cac130de251f2092c389b374621151b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5A 16784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.