Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3e0d10dd9d6ac…

MALICIOUS

PDF

76.9 KB Created: 2021-03-26 17:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7766862145354b951c2d8a483517dc6f SHA-1: 12cfac914cb06f6f031979026aeb28f26025cc8b SHA-256: 40b3e0d10dd9d6aca101a4b3428b23acdbe99f27c16a16a0f73f540986b66579
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of external URIs and the ML detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/strik?utm_term=nombres+para+ni%25C3%25B1os+sacados+de+la+biblia PDF link annotation
    • http://bezerojiw.scienceontheweb.net/academy_stars_3_pupil_s_book.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/2gig_change_master_code.pdfIn PDF document text
    • http://pesowulil.iblogger.org/17141990941.pdfIn PDF document text
    • http://dreabling.online/us_army_information_paper_format50ceu.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/80706248262.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_to_take_apart_a_treadmill_nordictrack.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/7431042341.pdfIn PDF document text
    • http://naturwows.space/wewuxakazudex4aexk.pdfIn PDF document text
    • http://konsalting.info/wapinajepizitasivuxonnavml.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafijid.atwebpages.com/propaganda_techniques_in_today_s_advertising.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a2ccdb-ef90-4377-aa6b-ad4bd1daa3c9/sony_a350_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6954f0f-8d43-4d14-beea-871fec9f3efe/86746752776.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/29846140560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaff20a3-f3b4-401f-a105-c8f2a90e5941/molecular_biology_of_the_gene_7th_edition_by_james_watson.pdfIn PDF document text
    • http://namigiregi.epizy.com/what_does_bourgeois_mean_in_marxism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3276d98-fc97-4716-9c75-b008ad5561ba/91187541714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b898e72-7f38-47ac-9a1a-156fd9a15ece/stihl_ms_250_c-be_chainsaw_for_sale.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/fegejutasewepi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5540 bytes
SHA-256: 25c86863a97796098bc059d35a990ea7741c773cbb13ba720f0bb8d84b0fdd16
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 13416 bytes
SHA-256: bbbcf8ce77fab25860a01b64c43757371408be3fd87a0a1651673f992fb44426

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