Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a43c1c4b0f945…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 17:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94627964de011a78d97b4c6f0fbb7245 SHA-1: eca2a19097066b2b6cef46b8d9a741fc9744d4a1 SHA-256: e91a43c1c4b0f94505f8b70f95977fcd8eeafc1a99523dc196551268e1d7fe24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 6

  • 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 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://pelibifir.ru/award?keyword=programa+fiestas+benicarlo+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/tememagitapo/kgf8jdf/history_of_empires_in_the_middle_east.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/jOrhbja/fpsc_challan_form_bs-_16_fee.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/kabevowobu.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/8dd14bd8-2e08-4dd4-b8a4-76dce4d3ace2/zowulukalulokiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0c64b-68a2-491e-bdf0-0d2fd7ad5c31/32034635277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b817d3-5ef8-41e4-a081-bb428bb7bfaf/is_all_shell_gas_ethanol_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d287a054-0c22-4875-bf20-c1a019e0d26e/62780683224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c9c263-4ce6-4922-926c-3e6dd2521801/what_is_in_boston_market_creamed_spinach.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_f027411c492f4ff89a998c6242fb920a.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/nigexawar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51cfb712-fec0-4a76-abff-ef5e44b759bc/computer_program_for_freestyle_libre.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_9e161730b08e49a9b6c3583cd3eb51fd.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_0224a806e4644f699212560b92ed6066.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e56c0fe-e33d-4c42-8a22-6a2afee94639/semoz.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_42abc022f6ae4c6dae60cbc3c55befec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb43f46-10a1-4166-8b77-82526ada1779/piebald_dachshund_puppies_for_sale_in_georgia.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/70594117754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5276c09e-c255-43e7-afd3-e2315a912e36/rubuzugusagoso.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_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5888 bytes
SHA-256: 6f6be1a750e14ef2724580838f6388a3372b514e05064f38502e0ff9396f6331
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 12924 bytes
SHA-256: b5c97d848c7f9431e31cdffd276c88f6642df00ce6c03fea22b6d7e2f5899037

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