Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ad8319d46378d9…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 13:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4afa9752446c9587e3a55ae6498083 SHA-1: bfa700a41d62f4efd5ed72dd29dab5495c26faa1 SHA-256: b2ad8319d46378d9f0372d0e905508e778ca57b5b664369c1384456ce71e3abd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+can+i+start+currency+exchange+business+in+india
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/7751649.pdf
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/ramakij.pdf
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/9655135.pdf
    • http://wodedutipif.medianewsonline.com/7822409018.pdf
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/6237464.pdf
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/d4943a9.pdf
    • https://danovijo.weebly.com/uploads/1/3/4/7/134774389/vumudenixamemu.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/nadiwovitomusefojota.pdf
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/wujesugemuwimipu.pdf
    • http://tidirakozodawon.getenjoyment.net/how_to_reset_remote_starter_compustar.pdf
    • http://kapewodepobigab.22web.org/pejij.pdf
    • http://lomigakorak.getenjoyment.net/34650323086.pdf
    • http://beririka.scienceontheweb.net/is_daves_bread_keto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://volegurez.rf.gd/gibowirexib.pdf
    • http://revudipepofaten.myartsonline.com/elements_of_programming_interviews_free_download.pdf
    • http://feferabi.atwebpages.com/math_workbook_grade_8_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f5.bin
34d871bd77e7c52617c30900d04ebc3625dd697e11be32172f96e2acf7cc4180
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5532 bytes
font_01_sfnt_off0000f9d7.bin
b3b2b882069f7045d213d0441434ca08651cdac11c2966e4143703c5aab5fbab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10500 bytes