Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d6adc91b688650…

MALICIOUS

PDF

79.5 KB Created: 2021-03-13 17:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 442b312187434e68f070fe4948a76190 SHA-1: 4e90d671b7c01ad87f1108a8a94e36f87e4441de SHA-256: f1d6adc91b68865054da90b992cb4587c952ad63c412b43b4a0d167d4772d2eb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains embedded URLs, including one pointing to 'nipisod.ru', which is likely part of a phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to redirect users, further supporting the phishing lure.

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/strik?utm_term=everstart+maxx+jump+starter+troubleshooting PDF link annotation
    • http://poniwipojoxowo.22web.org/how_to_update_webos_on_lg_tv.pdfIn PDF document text
    • http://pigetubivefenux.22web.org/traduction_anglais_franais_fichier_en_ligne.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/indirect_address_excel_different_sheet.pdfIn PDF document text
    • http://dedekuwetom.iblogger.org/gagolusuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lowazuxakosilal.epizy.com/giradiva.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_c9cdcb9e564e430c8ab7b2a453c869de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cece58-2732-4e77-aafb-b30bca2a6e42/psychology_books_to_read_online.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_8cebc429e1a2464694c8e0aea74f20ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/76804449914.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/easy_ukulele_songs_popular_youtube.pdfIn PDF document text
    • http://wotanuxofewaru.rf.gd/nutivezupuzaxekidemu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/bizoponigapifejezagomew.pdfIn PDF document text
    • http://ganusigesu.rf.gd/libro_hambriento_nach_completo.pdfIn PDF document text
    • http://tagozenumuzem.rf.gd/cuantos_centimetros_cuadrados_tiene_un_metro_cuadrado_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02316242-1230-4328-ba44-632b8213f83c/48049417216.pdfIn PDF document text
    • http://vasedazixi.rf.gd/81054286829.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_b94b25245e2c47a7ba16d3f76942ae70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/69468545461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372a8fa0-9598-4cf1-a532-6f054b379086/copytrans_photo_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7c6e91-1635-49ee-ae26-796da0b97853/39260763860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1199fbc-7acf-4111-b81f-558afef42a0b/ccrn_study_guide_free.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5536 bytes
SHA-256: 2d340c272420d4dd570c9e73334db003c0836703e4706d3b1e7e4061f8bf2c4d
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11896 bytes
SHA-256: da04470ea436d3a48850eeb7bfc5843a5f4a1d2652184eae84c3648d3d046ba1