Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8432b42aed58ce…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 15:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 70bd08f575ed1175cc75374422317c48 SHA-1: b63f3419d23194c8a744b9df2f53b695f1699397 SHA-256: fb8432b42aed58ce27877ad962f96a79ff7ceeebae885361bf93b0f89037ca6a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=ski+safari+mod+apk+2 In PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/sawivilirex.pdfIn PDF document text
    • http://dimupure.22web.org/how_to_activate_keyboard_light_on_macbook_air.pdfIn PDF document text
    • https://somakala.weebly.com/uploads/1/3/1/4/131409557/5543468.pdfIn PDF document text
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/68d11.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/24eb0.pdfIn PDF document text
    • https://vuwurata.weebly.com/uploads/1/3/4/4/134481670/tojokanaluzikap.pdfIn PDF document text
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/damatajaki-jufifenupebodu-jitefinedadapid.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/1315861.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/6d1790b5-7007-417b-8dfc-9802c5ea06f3/books_of_the_bible_in_order_bookmark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5535f3e5-2a2c-44cc-a0dd-c7748d11745e/fozudavinizutawabadef.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/93168637739.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/common_sig_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8cef857-951e-46c3-b1aa-c4a352a354b2/how_to_draw_anime_hair_very_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a09788-ea09-4556-967c-4fecc0680e86/what_are_the_multiple_intelligences_and_what_they_mean.pdfIn PDF document text
    • http://dopozidimosopa.rf.gd/facebook_messenger_apk_por_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc2edd6-ea62-449b-9d18-656883466594/how_to_check_dodge_dakota_transmission_fluid.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/best_spirit_blossom_ahri_chroma.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/lincoln_210_mp_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced09202-fdfe-4aec-b4df-01dda8a3168f/bernina_artista_180_price.pdfIn PDF document text
    • http://jojofolarimema.epizy.com/new_upcoming_bollywood_movies_trailer.pdfIn PDF document text
    • http://suvoxezol.rf.gd/kuwait_airport_flight_arrival_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb82f22d-42e2-4513-b1df-656ff49d3664/dowofozupax.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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 5452 bytes
SHA-256: 71277661d582b95aba3def2d2e105f9d192467843769b9662f054873ee9332eb
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 12160 bytes
SHA-256: 707eea254caa844e4119030a7825417427ff9f599f86acbd3ca33588330d7130

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