Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba6751cfd71c687…

MALICIOUS

PDF

160.3 KB Created: 2021-06-05 14:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7527b55f40b86252415b6b75ea170a9a SHA-1: bdc6833da5ee437825ff5f38d024a25cb9ebf0cb SHA-256: fba6751cfd71c687934302870cc81f67aa61ee977706593b6ddb124bb529b5c0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The PDF contains a large number of embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or conduct phishing. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=khasi+catholic+gospel+song PDF link annotation
    • https://daviwajid.weebly.com/uploads/1/3/4/6/134609730/dimekebifi-vilejutojuk-kefeli-wasobuziravix.pdfIn PDF document text
    • https://pamopalosi.weebly.com/uploads/1/3/4/8/134857187/8416915.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/vazuwusitewomij-donofigetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_60b8994ff24d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff362a2b8b87.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/tusofow.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/f82633595b2a4b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_6002e246d6de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6023c9c989c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460232/normal_5fe395ae6f3b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujupaw.pbworks.com/f/46630148766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1048ae-73d7-4324-9228-1ef5ff927e1a/15821562905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0819ac-d1a5-400a-951e-313986a8f183/2761369379.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/79475037632.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144521637/cdigo_de_processo_penal_pgdl.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/58822949250.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144609678/xowukawosolemiguletet.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424524/cuales_son_los_tipos_de_sistemas_operativos_mas_comunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd76b05-d5de-4ab1-b6c2-2bfce2bf06ec/pugijesuzidijepovemunef.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144493938/kaxokogapegaxesog.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/what_am_i_riddles_answers_200-300.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_off00023923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23923 5068 bytes
SHA-256: b20955fd8a08565af484d62dd369c1986eda521136276559870d799ee3a0181e
font_01_sfnt_off00024a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A67 12760 bytes
SHA-256: 2f2eb630fdb9397402a51b77d22079c13ff2681c89930dd5b3a0b618a6456844

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