Malicious PDF — malware analysis report

Static analysis result for SHA-256 c618c9a410df0373…

MALICIOUS

PDF

74.2 KB Created: 2021-03-04 12:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 43f670d488c51e0b3a2e1b5cc50ee3f0 SHA-1: 7c3affb0c8ea59109c4613d2c059c2dfc1a80c17 SHA-256: c618c9a410df03734dbe8b3afc283b9b1b09674eb26089e76a50125274dd2045
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a tactic to obscure the ultimate malicious destination. The PDF structure and embedded content are consistent with techniques used to redirect users to phishing sites or download further malicious payloads.

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 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://kuzutuzo.ru/123?utm_term=how+to+collapse+chicco+keyfit+caddy PDF link annotation
    • http://vomimaforotagi.mywebcommunity.org/60946540929.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/hoover_floormate_spinscrub_replacement_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446038/normal_5fcb738ac71c7.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/40918993953.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jjdEajj/xufebukelude.pdfIn PDF document text
    • http://lovelyhouse.online/5563524114x212u.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/hitachi_compute_blade_500kux9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fe811f1e14d7.pdfIn PDF document text
    • https://cdn.sqhk.co/tagisaxozof/gfjjcev/sdge_san_diego_jobs.pdfIn PDF document text
    • http://drenajkrasnodar.ru/9243566028yzbih.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/naxerorog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6016a9fb31f47.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/is_cna_certification_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jiiAjbm/wimominug.pdfIn PDF document text
    • http://afracheat6.xyz/paraiso_travel_libro_gratis1nclb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471996/normal_5fca598bade8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_603227b064f56.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jaIrif0/72563844853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5364 bytes
SHA-256: 621e4698e221fb219d6afd9a188a0a846ae16203aadc65b2a70d1e01af34290b
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10408 bytes
SHA-256: a8da96d2b4aed9f54a9c12327ceeca4f2e4324bcc5281abb2f54ff0feeadde4a

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