Malicious PDF — malware analysis report

Static analysis result for SHA-256 453374cca44e7455…

MALICIOUS

PDF

77.3 KB Created: 2021-05-28 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e7d9abf485eb6a59ffc3cef82fdec49f SHA-1: eae30a34d896598b7c7371f9f4d41f1afc65e7a9 SHA-256: 453374cca44e7455910626efdb131822da4a34dfbf34639042c54426e7449f2e
186 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 disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of external URIs and the link farm heuristic strongly suggest this document is designed to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=braun+thermoscan+6022+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455670/normal_6060f67a4e430.pdfIn PDF document text
    • https://muzavixoro.weebly.com/uploads/1/3/4/6/134647253/f40c88d8.pdfIn PDF document text
    • https://xuvetopugoseja.weebly.com/uploads/1/3/4/4/134484667/zevorufajasega_vuzimugipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5fd727eede38b.pdfIn PDF document text
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/ae1b13b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_6036e25231b08.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/novisitozekufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5ffcfb11a47d6.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/4ab05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_603ac587df60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_605f4400815a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_6044953cb4190.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/42260756-a84f-434f-b474-0f1ad7a6be32/brown_vs_board_of_education_was_a_supreme_court_case_related_to_what.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a394a86-1a2b-45aa-ae0c-0a0d10178094/what_is_var_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806bb96b-f1f7-47a8-9964-da3d2ed18382/how_do_you_spawn_a_bulletproof_car_in_gta_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4efa07-a750-4a7d-ac15-56b982949cd3/kunonozoxewixito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6355bc9c-1f07-4409-bbef-3a1e25654cdc/66187121686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3938353b-2ef8-4327-9b3c-f55265e88991/codycross_grup_64_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cbb533-0f83-41f9-afe2-537a79fb1803/26135303867.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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5872 bytes
SHA-256: 7dafad827348e5738ede4e99a3e6c52bff2717a633d34961a6b48425121ecf32
font_01_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 12116 bytes
SHA-256: 85575fe5ec272480f4e16b22801b54e1fa4d802c46269bc8c940b9887de68df8