Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb8d2ad36d3da8…

MALICIOUS

PDF

78.0 KB Created: 2021-05-14 02:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8410877e3f7f6d2cbe23a63dfc212305 SHA-1: a8bfb9a7d45bb059697c00add8d1260697fa07e0 SHA-256: f4fb8d2ad36d3da8f888fabca630bc21ffb9fdfa42f7710b19638f7193e8a246
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 of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing campaign designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest 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-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://jacksth.ru/strik?utm_term=dress+up+day+ideas+for+red+ribbon+week
    • https://cdn.sqhk.co/kuzosexiwugu/5dQjfYt/6667947212.pdf
    • http://tefuvawilutir.mypressonline.com/oregon_state_university_campus_map.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601934d8ced85.pdf
    • http://kirakexig.mypressonline.com/additive_manufacturing_materials_processes_quantifications_and_applications.pdf
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/8bef6d49cac620.pdf
    • https://cdn.sqhk.co/xenudipu/hhhjaic/71734396649.pdf
    • https://cdn-cms.f-static.net/uploads/4491432/normal_605078180a14c.pdf
    • https://cdn-cms.f-static.net/uploads/4426257/normal_605c93e788fbe.pdf
    • https://cdn.sqhk.co/lixejudazeza/ghhgJid/resident_portal_login_bozzuto.pdf
    • http://xepewifub.mygamesonline.org/ncert_solutions_for_class_12_accountancy_part_2.pdf
    • https://cdn-cms.f-static.net/uploads/4452381/normal_603b7192af9ba.pdf
    • https://cdn-cms.f-static.net/uploads/4450351/normal_6063340a60263.pdf
    • https://cdn.sqhk.co/jotepomi/FI4kjaq/87044560401.pdf
    • https://cdn-cms.f-static.net/uploads/4393179/normal_605b2306cd6e3.pdf
    • https://cdn-cms.f-static.net/uploads/4423429/normal_600f983cdfe6b.pdf
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/de04f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tometubufimopim/informe_justificado_amparo_indirecto_formato_administrativo.pdf
    • https://s3.amazonaws.com/kobivimelelo/nisutolovetowiwefif.pdf
    • http://nujugeteteda.myartsonline.com/arm_microcontroller_programming_c.pdf
    • http://jalijoruki.atwebpages.com/61213406601.pdf
    • https://s3.amazonaws.com/gozilum/why_is_my_printer_not_printing_the_top_of_the_page.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_off0000eff5.bin
504dfe37850690d46d25f3f7da17cc3670eb6b63b9a81c4d5853e8855fb25345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 5400 bytes
font_01_sfnt_off00010282.bin
263a0713da118ef8c2558b46822bd09371efe2692d2fb059ee603d36c1da509b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 11204 bytes

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