Malicious PDF — malware analysis report

Static analysis result for SHA-256 50518ea90f7862ce…

MALICIOUS

PDF

75.1 KB Created: 2020-12-19 11:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d326c008869a2b497f9565aeb57b797a SHA-1: 1356b4b0e4e0aea6d6caadd9b47f588fe176445e SHA-256: 50518ea90f7862ce52d3cacf906a76d1327893f4f08a2a15d592496d69c51bf5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on different platforms. The primary URL, 'https://traffnew.ru/strik?utm_term=thyagaraja+aradhana+2020+hyderabad', suggests a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=thyagaraja+aradhana+2020+hyderabad
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/bufewolinu-xezoponuzowe.pdf
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5fc7d973b75f7.pdf
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fcaa480d984a.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5faabae81d607.pdf
    • https://cdn-cms.f-static.net/uploads/4496389/normal_5fd22b12648ea.pdf
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/6821656.pdf
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/woguwilini_sadaz_rowuv.pdf
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fd1d55f24730.pdf
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f9f74561e957.pdf
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/92c690da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5a88b8787e879898c667c/t/5fd67ee7ab1a676c7292bc73/1607892712567/15743130883.pdf
    • https://uploads.strikinglycdn.com/files/ee863cdc-886e-4e1a-994c-cf5f59b79067/foxelafujojijax.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://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_off0000d2ea.bin
0bb1dc0cf3f712951a20e832c912d295a36802abceae8f8c9ac132aabd689189
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 5420 bytes
font_01_sfnt_off0000e557.bin
2a935b8f2fab91845a71db610314d355b55f6e28ac43ab887242e034a800e83d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 10948 bytes
font_02_sfnt_off000109dd.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16204 bytes