Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1433488089dfa34…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 19:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f778c4736cd6d4705a49fe0a67dc3510 SHA-1: d3514b08a117246ee5ff879a61d678b2adecd9c5 SHA-256: e1433488089dfa34dfd94702e6942edfc9b3a44dfb0868aa234b287e784b41a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://xezojetit.ru/strik?utm_term=fluval+406+external+filter+parts PDF link annotation
    • http://cyberghost.store/outlook_email_signature_design_template1lzvd.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_happens_at_the_end_of_killing_joke.pdfIn PDF document text
    • http://storeeu.info/scoutbook_app_appleuoqay.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/oecd_guidelines_transfer_pricing_wikijnlfu.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/pop_os_installation_guidecf2go.pdfIn PDF document text
    • http://parkingtest.xyz/fewumuzosubalitumavax0lx4r.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/vuxogigikedagoda.pdfIn PDF document text
    • http://boothattendant.com/jitapufegewajojugidair0.pdfIn PDF document text
    • http://xviiivbgz.com/guwoxarumelebiwejuxowerb6tjb.pdfIn PDF document text
    • http://tameeniraq.com/hamilton_beach_easy_reach_toaster_oven_instruction_manualt8qop.pdfIn PDF document text
    • http://vodoroding.info/kitty_cat_story_cat_avatar_makers6a32.pdfIn PDF document text
    • http://miiliioner.xyz/naxaziwajuqdau6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0797b31-a5d9-433c-9fd5-10744df97c17/what_stocks_are_listed_on_the_nyse.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/zagugup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546cca45-6da5-491a-bfc2-46fcf70ca263/rebis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d407b31-f1c2-4366-af83-50db26b6cf3d/worunisituratulefeme.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/bed_sheets_for_sale_in_nairobi.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/what_can_i_plant_in_january_in_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/ponazebejiseg.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/how_to_block_numbers_on_sprint_android.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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 5360 bytes
SHA-256: faedb95619d96d909c401618c21ddc2fff421f1f5d2e94fa2240c268c8dda35e
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10808 bytes
SHA-256: 26e15d55fd5e0deb2d1573f6061bc6685dc664b347b2923363f3eab75181438e

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