Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cf5400c5114d22…

MALICIOUS

PDF

80.7 KB Created: 2020-11-24 12:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cc68e4f286bb074a940632f7b2951e SHA-1: 7859a6de1aba5785b4116e0a441ca133e719ec4d SHA-256: d7cf5400c5114d22903daa9d3d789e82e49777e56b8d89732a545a6ab482d7d7
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 embedded within the document body and disguised as a free pattern download. The primary malicious URL identified is 'https://traffnew.ru/strik?utm_term=womens+board+shorts+pattern+free', which is flagged as unknown reputation. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=womens+board+shorts+pattern+free
    • https://gufamaran.weebly.com/uploads/1/3/4/0/134017683/lavesut-kapazaja.pdf
    • https://vizakadaji.weebly.com/uploads/1/3/4/4/134491897/fuxet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d98ea6e-dd2e-4ea3-9517-7834a08c7412/xekakagazojobo.pdf
    • https://uploads.strikinglycdn.com/files/6b3d1132-d119-4a94-9c6c-1eba8570a33f/novela_zacatillo_capitulo_30_salome.pdf
    • https://uploads.strikinglycdn.com/files/2cfe777e-2cbf-4a51-8b7e-e5acff0d8766/xigoxa.pdf
    • https://uploads.strikinglycdn.com/files/7f5621e1-43aa-4de5-8da6-5de288bdaaa3/72498576599.pdf
    • https://uploads.strikinglycdn.com/files/66c72592-939c-4700-8170-774195fdf83e/estrategias_de_sustentabilidad_para_el_escenario_socio-cultural.pdf
    • https://s3.amazonaws.com/zinudipir/zotukibogekarurabukuwiti.pdf
    • https://uploads.strikinglycdn.com/files/5052b6e0-51e2-4fcc-b7bb-205e6880ecbc/rejog.pdf
    • https://uploads.strikinglycdn.com/files/80a09158-5289-4e4f-9c12-a6141f49c71b/bipodavokig.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/70282400186.pdf
    • https://s3.amazonaws.com/wiwuxot/48284640501.pdf
    • https://uploads.strikinglycdn.com/files/4657f7dd-0605-4d51-94c6-885aaf4a6ed4/suxizelawokadaxuraxojew.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
    • http://sinhala.sourceforge.net/
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITS
    • http://www.gnu.org/licenses/gpl-2.0.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c749.bin
7588945328ff2b832840f424c9955bd4b096356c47a8ba827280481eec4f29f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 5400 bytes
font_01_sfnt_off0000d93e.bin
12f2cdc65c96914c13325fa81c0c517dd8fe9cc2d84e451365e37e771c090180		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 16448 bytes
font_02_sfnt_off000103ff.bin
b603766ad733f7771374b79a2f80cd250a47b929a4080cfcc243502d21352835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 15864 bytes

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