Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec5330880cd9d6e…

MALICIOUS

PDF

82.8 KB Created: 2021-04-04 00:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: edf11006dffd1b120fffce5f4ea3ddf7 SHA-1: fae5b3706f3abaf4ece5329d018fb52484171c17 SHA-256: cec5330880cd9d6e3256bafd3b091ad4bf47197c02f53b548cf9dc1e8fc8d577
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document body, though partially garbled, suggests a lure for downloading a book. The presence of numerous external URIs, many pointing to disposable hosting, further supports a phishing or content-luring attack pattern. No scripts were extracted from this sample, but the PDF structure itself likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/award?keyword=cutting+edge+book+pdf+download PDF link annotation
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/08c0df40e30.pdfIn PDF document text
    • http://kuninikulu.iblogger.org/kamala_das_my_story.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_604772247ef2d.pdfIn PDF document text
    • http://xokoden.22web.org/levotorugopofajobik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffa5c6e6a49d.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/polomiwiwebutojebisi.pdfIn PDF document text
    • http://mukogojusilu.iblogger.org/rodokiz.pdfIn PDF document text
    • https://tifuvanolini.weebly.com/uploads/1/3/4/7/134703883/nexizafemagegam-jokalerarilu.pdfIn PDF document text
    • https://puxanakiwe.weebly.com/uploads/1/3/2/6/132695454/87698cf006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonupov.epizy.com/81156505138.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/52006335572.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/59449940291.pdfIn PDF document text
    • http://nufeluzuxaluw.epizy.com/22539996522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ab8202-4a6f-43d8-bd25-c187a9156a7f/74799925715.pdfIn PDF document text
    • http://radawewivilu.epizy.com/tipos_de_comunicacion_verbal_escrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95602f05-4381-425b-8b92-6f89af14233a/why_does_my_printer_randomly_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acd838f-9e6b-4f99-b25d-e444a51dffc5/98036390870.pdfIn PDF document text
    • http://vuxomukixade.epizy.com/telugu_akademi_botany_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123d9cbc-b1b3-489f-b704-a65031faf382/panav.pdfIn PDF document text
    • http://ziwunoli.epizy.com/99322784720.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_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 5136 bytes
SHA-256: ac43f97095d5a99605453c9446465a4b9071c22b2d3e24086f196008da5b7ae0
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 16464 bytes
SHA-256: c3ef0edfe145f9370da51739ceb5dec99a0b663ef893af395f8af8e26115ba95

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