Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3e28322cbaa27c…

MALICIOUS

PDF

75.2 KB Created: 2021-02-13 20:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3428e528b9110f033887ae9f7ea1d980 SHA-1: b841f599070908e573e7226dce53bd0b837c3719 SHA-256: fe3e28322cbaa27ce0d649489d96dd252266a18e3cee55dbc0d3093b13e14e2b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=fact+and+opinion+worksheets+pdf+high+school PDF link annotation
    • http://bajelow.iblogger.org/mixazojejit.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/fuvifekibixof.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jhgg2if/lofinet.pdfIn PDF document text
    • http://makeyourself.xyz/bittorrent_filehippo_freekk7cf.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/jl3hjjd/exothermic_process_and_endothermic_process.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/WgewiaO/alan_hangover_baby_t_shirt.pdfIn PDF document text
    • http://soldatskaya6.ru/kikolevaxubojubulojthg.pdfIn PDF document text
    • http://websecurer.tech/bengali_ranna_bookda9o0.pdfIn PDF document text
    • http://prostotit.site/chocolatier_trogneux_lille3fjnd.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/gd7gf2h/american_football_league_table_2020.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/xetag-bunemaverux-sakudokamito-vorakavakepixeb.pdfIn PDF document text
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/burufulux_wegetuvebubabi.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/6404382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejigavukolu/bonetown_free_pc.pdfIn PDF document text
    • http://binawojojin.epizy.com/nuvozuxevijukixulif.pdfIn PDF document text
    • http://pomadepoxe.epizy.com/12949688262.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/voltage_transformer_110_to_220.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/methylation_of_amines_with_formaldehyde_mechanism.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 5316 bytes
SHA-256: c128bb244178ba351a5645b64a3e392e17d5fbc3814aa7dafa69c7f102512edc
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10528 bytes
SHA-256: e0397cc6ece2cbd77e66f2a67eb8d535c41a1a37eae4f6a77f170e712a0f9869
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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