Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d54042d091e09e4…

MALICIOUS

PDF

87.1 KB Created: 2021-03-28 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4607306682c5679906cb9886c2c88b1 SHA-1: 538de43c5dad1bf2476b88b40b13fbca71e261a7 SHA-256: 7d54042d091e09e4c5023d80b13591e045fbc61e0ca6a03bcf1e34f1d109ddf7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=how+to+play+simple+chords+on+ukulele PDF link annotation
    • http://gagefiwirimat.medianewsonline.com/21258719847.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/wizadijumuvutovog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fe5e2804a659.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/gutebumed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_602cb2eadaaaa.pdfIn PDF document text
    • https://purotuduveb.weebly.com/uploads/1/3/0/7/130738796/tetokanedepot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fe8fafda4c38.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/vujisezowebogeneloruzot.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/39e5cb1c929c.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/62631541871.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/0bb808af-3777-41a3-9ec6-817f655b701a/dugowotiwafedone.pdfIn PDF document text
    • http://vapasiwivomod.epizy.com/44549663594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4fb6f4-38cc-4903-b1f8-d31cd29f51a7/biziliwesoxuwadasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4278314e-0503-404f-be02-82da83a119df/fallout_4_mod_issues_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f9a544-62bf-45ea-af8f-40b73c657707/what_is_business_management_consulting_services.pdfIn PDF document text
    • http://sujosivetobifir.epizy.com/kaboxovez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07934d6-cfda-4b98-a99e-1d4bbdf2f0c9/feliz_navidad_movie_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51368b7f-bd72-43cf-8a0a-d9b052cc89ca/65594300452.pdfIn PDF document text
    • http://pesabumurusese.epizy.com/toccata_und_fuge_d_moll_bwv_565_noten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebd7d32-3665-4a5e-aa5a-39d12f2c9994/49988647075.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_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 5532 bytes
SHA-256: dd41e7d73dfd3b53626a9a2c12b55fc73afa5a3c3eb21c05905bafa7fa787604
font_01_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 10984 bytes
SHA-256: 412d9c7929b7366e2eb5ee9ad3651b6cb7ae85ffdbb08374dbe92199cd615d99

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