Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca541af504c82ff…

MALICIOUS

PDF

76.8 KB Created: 2021-03-04 10:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 83ec5845ed30f6bec0c91a2bf1c6cd05 SHA-1: e3f618fe299caf3cf1b378df08f38b7e224e1a84 SHA-256: dca541af504c82ffdaeb42ea2b2284fb2d6320ce1e19213747d3ba213d9285ce
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on Weebly and other services, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=what+is+an+automatic+flight+control+system PDF link annotation
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/2365095.pdfIn PDF document text
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/4892590.pdfIn PDF document text
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/xasuwogiliv-temiruwudogola-dulazijej.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/t7mgfQf/prison_escape_level_20.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/ggLbpij/comprar_recarga_claro_guatemala.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/4J1haiB/91916416481.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/47611377191.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/76022055678.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/fuveratopirexewizaz.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/how_to_lose_thigh_fat_with_resistance_bands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/19012812871.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/scrum_master_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/vavokuvegijepikawuzafow.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/thyroid_in_pregnancy_guidelines_rcog.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/checkpoint_vpn_troubleshooting_guide.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_many_carbs_are_in_a_slice_of_margherita_pizza.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/67837100490.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_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 5412 bytes
SHA-256: 98a61adf87a142e31c399d4d72c31f6f0304af3343db959fe83b2bc2d2583980
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10144 bytes
SHA-256: 6ade9e34cf02a14fc7caba4dbb472d668734930a26210a6ccb683eb2c949fead

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