Malicious PDF — malware analysis report

Static analysis result for SHA-256 635a26ebfeb1564c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 09:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9f8c50446c6ed62b2e0fb130ee603ab SHA-1: 553f7ce9ef45c2fa3cd372bef7cd52ce0ed1e14e SHA-256: 635a26ebfeb1564c02a78efee74d8447e4cc741ee3605fcb9e55858ba129657d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The embedded URL 'https://jottigo.ru/123?utm_term=best+app+to++videos+off+instagram' is likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=best+app+to++videos+off+instagram PDF link annotation
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/3801342.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/bb30e03ef0306f4.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/jjq2eif/ripl_social_media_marketing_for_small_business_books.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/tjdlQ42/my_collection_images.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/ojaVjhO/zamovev.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/xurogojolatem-suguzu-dofulotuvi-kogir.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/861b70.pdfIn PDF document text
    • https://jojijuwewit.weebly.com/uploads/1/3/6/0/136057333/932743.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/fggibby/50581784744.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/gZVlmii/65361987443.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/5410560.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/tisoteporirewurepub.pdfIn PDF document text
    • https://nolegajaji.weebly.com/uploads/1/3/4/5/134519786/nuwejulibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tugepujato.rf.gd/wharton_case_book.pdfIn PDF document text
    • http://lixazavifamu.rf.gd/86496004142.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/funny_cartoon_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/fuvorazemusenakozobolize.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/merriam_webster_dictionary_2017.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/actualiser_les_formules_excel_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/palmistry_in_urdu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/vibexuliminubite.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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5436 bytes
SHA-256: 049d091389c56149f9bd96ba7381410f1600c0ea84407a696d9cf149e74b6219
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10596 bytes
SHA-256: e87161656b9a38c7ef199ef82bb2985cb450f077ae81cc2fa0ef65de6893868f