Malicious PDF — malware analysis report

Static analysis result for SHA-256 421d27cae4effb78…

MALICIOUS

PDF

74.7 KB Created: 2021-05-23 14:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 52169117323114359363fde908bc3496 SHA-1: 5fcf9418b48fe731698f519eaf75fc6c7887a346 SHA-256: 421d27cae4effb789d549e4a9c4b183205a57a259408074f886e2ada18f21bea
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external PDF files, one of which is associated with 'tamilrockers 2015 tamil dubbed movies free download'. The presence of numerous external links and disposable hosting suggests an attempt to distribute malicious content or phish for information. No scripts were extracted, but the overall structure points to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://jottigo.ru/strik?utm_term=tamilrockers+2015+tamil+dubbed+movies+free+download PDF link annotation
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/zujonotosizomamiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_603e8d49b21a5.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/4b835a3352eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5fe70f7dc4dad.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/3149062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_605a5f1783076.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/7e20ee203615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fd62a66977cb.pdfIn PDF document text
    • https://lokowukaf.weebly.com/uploads/1/3/4/3/134315315/dojanifadu-zafadebek.pdfIn PDF document text
    • https://butabefuje.weebly.com/uploads/1/3/1/4/131437434/wotexevamutipabe.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/gedekuxevufud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5ff1164cd4dae.pdfIn PDF document text
    • https://xojolulodi.weebly.com/uploads/1/3/0/9/130969725/fabunabegop_risajisenajezev.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/vipuvororexixozub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/875dd815-9a9e-4fa5-b642-27257fafbc13/seburidisobefiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2a962d-e016-47ef-9d94-2f44ebc58d10/86345105108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37247c9-332c-499a-8bc5-22e19438779e/how_many_red_fives_are_in_a_deck_of_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebef95f-ac91-42a0-90d2-ae9c2b26254b/el_arte_de_la_guerra_de_sun_tzu_resumen_corto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08be23e3-5000-4914-adc4-3d1abb211f36/does_roku_support_5ghz_wireless.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 5924 bytes
SHA-256: f36623d9dc2470b3797b35e3c1dae2c3041b2cf8acb85012e95673aab1c4d28b
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10528 bytes
SHA-256: 02f30e4e7ade702e08612b8aac660043bc15301b02e2725b81a409a6e727be4c