Malicious PDF — malware analysis report

Static analysis result for SHA-256 4363c13deeeef0a3…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 07:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: adeda5b66cba91484de79b92f8546912 SHA-1: 5a8970ff2e3f024526ad04a3d379db536cbf94c2 SHA-256: 4363c13deeeef0a30f8d5b9f3fa1c3e1af1e39d55c8d6c3e4cdc119f53cd7de2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious URLs, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=why+is+my+cyberpower+beeping PDF link annotation
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/fd051dbd70c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6021a546566c6.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/137139.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/5867841.pdfIn PDF document text
    • https://luzejezoroze.weebly.com/uploads/1/3/4/3/134361740/pagimewabifugabali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5ff2c00c3c77e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_6014f5058641f.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/6255750.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/gejdidE/45640856295.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/ejihjbb/6283979044.pdfIn PDF document text
    • https://wokugosag.weebly.com/uploads/1/3/4/3/134339956/xelojokememibazatuti.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/rival_4_quart_ice_cream_maker_recipes_no_cook.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/uhdRS7T/major_landforms_in_asia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_604d5d1ed467d.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/11584927272.pdfIn PDF document text
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/6723922.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/5016402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/sipuburumep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59243268-9140-4162-8e49-98679f54f6f3/the_time_travelers_wife_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0056954d-cdb8-4ce7-984f-f660b1174d65/82189823280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17626ba6-f0bb-46a8-ac39-c7ccd71d9dc0/gitofagode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ca1034-054e-4d4d-b772-c6bebb645fac/how_to_become_a_planner.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5452 bytes
SHA-256: 4a8bbce98cc68b246e2a58b85abfeb03448650fdaf4d766f6097b456f9e464d5
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10976 bytes
SHA-256: d28b28f885d43322464e89b5c8e77e003f20d33251dfb2ffc5ee50616772725c