Malicious PDF — malware analysis report

Static analysis result for SHA-256 418b0c75abba707e…

MALICIOUS

PDF

83.0 KB Created: 2021-03-18 12:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d50ae806184790b909be03b28670246f SHA-1: 284d3985dfec6f82da850fda96c74506b4aab3fc SHA-256: 418b0c75abba707ecadf6eeb031096dab776d8f33cacdb826d7c12807ef3cf3d
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to disposable hosting, and a primary URL suggesting a search result for downloading software. This indicates a phishing or malware distribution attempt, likely leveraging a link farm to obscure the true malicious destination. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/wix?keyword=download+spotify+apk+for+pc PDF link annotation
    • https://cdn.sqhk.co/funuwovo/jj9jjje/12249971012.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/5031175.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/fIhdvmy/polish_chickens_for_sale_houston_tx.pdfIn PDF document text
    • https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/rebof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/46020012088.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_5d54355ea6b643639d70bc28e0d1008d.pdf?index=trueIn PDF document text
    • https://7469a0d6-6819-4035-9404-80e80fbd4bd5.filesusr.com/ugd/c34eac_ab597903a2e24afbadf7f36f2ea1639c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/north_atlantic_treaty_organization_countries.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_0e72052854c648ac8a3020b1d984967b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/duvovawoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc727c7-3a42-4d1a-87f9-55f54621ada5/does_netflix_have_fresh_off_the_boat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a838d28-0132-44e6-8210-b30f882bb79b/17754088596.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_cf6eaebf1e8e42e6816a70c9b3fa1232.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f88cab2-98e7-4589-ae1c-228e8c90d505/50361964142.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_693814e6e9b0494e80cef847bcb188fa.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_fa0a8562dd084f35abaee7666fc58abf.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8e501a3098204cb98a8f538e80f79cfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e780a9-f155-4694-a58f-383725d3e0b5/93498409457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10095e0e-5cc1-4199-b707-ee8ca79da686/fogowigolanirumusuz.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_f8213e5461644402b435724496949b76.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5404 bytes
SHA-256: 952fb77f779dca34c005cae74cfd78f913eeeb3017c55ca834640d8923d21f83
font_01_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 11008 bytes
SHA-256: 7c430b4ef75df8d738795821a8c0cc9f6be2e6ee110143e34067b3617397bb8f
font_02_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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