Malicious PDF — malware analysis report

Static analysis result for SHA-256 9971b380544c93b5…

MALICIOUS

PDF

84.0 KB Created: 2021-10-10 16:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6cff1d9f3d6581d5e6519e1d116c543 SHA-1: a953e53e3fd7b3c3ca66a16a0a15d8c5704fae95 SHA-256: 9971b380544c93b5a328f3c23d2695285cb913e988e4e2e0116a9b9569688581
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://euchebnici.com/img/file/baren.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_29_15_28_07_1742.pdf
    • http://hoanhaochemical.com/uploads/files/78417430162.pdf
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/midiwetedemezosuvon.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/dijasugafoja.pdf
    • https://weborder.cloud/userfiles/file///32846864040.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148c87b504c4---gozinelimumalajovokesijep.pdf
    • http://hzyixiangchem.com/upload/files/44276379900.pdf
    • http://xn--80aa5alfu.kz/file/sibenikajiv.pdf
    • http://sxnqx.org/upload/file/Fl202110101455409712.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1c350fc9ec0e9f932923ba3f44dae195/89895743054.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1b99bfec14ee53a4d43de257a52aa004/vixowedukalalavumad.pdf
    • https://trieurodata.ro/images/file/67028634227.pdf
    • http://refinerlink.com/userfiles/file/82369543568.pdf
    • http://ch-yang.com/upload/files/40981017330.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/53077812232.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/41042488516.pdf
    • http://szerecsen.hu/editor_up/ninazojefilavivugofev.pdf
    • https://naucharts.com/ckfinder/userfiles/files/laxajewamide.pdf
    • http://hardiebase.com/uploads/assets/filefile/lubatafuwumezolapib.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/kapibarefipinivexozu.pdf
    • http://kolesa.sk/files/54490395039.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+chat+without+registration+online
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 16792 bytes
font_01_sfnt_off0000f965.bin
0396a26cbbd0fa82f0aee7d17128f9281b56f2a2b6f64d2f3c85bbfcfa9fa8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10672 bytes
font_02_sfnt_off000111de.bin
d0de06750fc7323c830ffdb5496a2fa3c63d8ac4303d217cc56a0fdc5bffd788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 18704 bytes

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