Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef861a5bf8383b8…

MALICIOUS

PDF

75.3 KB Created: 2021-05-28 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d780fab4f556e0eaa70a8dc576f20be SHA-1: b856c7b5eb83fcfdf50d53a85c0b16818c3cc44d SHA-256: cef861a5bf8383b807c5804d4c5e1a4083537a89d50f97015ec3c22fe95e44e3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=libro+el+doble+como+funciona+pdf PDF link annotation
    • https://zefipomez.weebly.com/uploads/1/3/4/8/134882075/7501726.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/1291107.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/wukelafanumetevo.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/314157.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/gudenesugi-buxefudejole-ronovixap-fukawede.pdfIn PDF document text
    • https://tusilagel.weebly.com/uploads/1/3/0/7/130739454/babelowa.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/kaxix.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/c3031886c6.pdfIn PDF document text
    • https://tozobaveje.weebly.com/uploads/1/3/7/5/137501006/rapukenetirovupimod.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/7192539.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/lukejigixijofop-lovaveba.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/646348ec-d67d-4f16-84ff-9299b8e2ff10/omicron_gamma_omega_psi_phi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918181f7-2dbf-48ee-b79e-9bc5913b1d48/postulates_of_special_theory_of_relativity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39417b05-9f95-473a-8196-fc0107d4caec/mapokerotideda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af57bde-6a10-42db-9ce8-c01c4f07010d/ragili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f274a9-0019-4ddb-ab80-7443940fcc2c/xixubafevipubopowadoxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a795c0d-5087-4d72-8c9d-42c777ea5487/timekituparuzajobixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce4ae5d-61be-44b5-b15b-cbf8ff6d4144/37351052677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839c8780-cd7f-4daa-8792-f2f5346a397c/70648761787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4739a1bb-fc2a-4be1-94b2-124111978ec8/fofemutovedilipazewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904dd2b1-f2d3-42b7-ae61-c0fca119960b/zifuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5364c0-a46d-4e48-89b2-7e905e735d5f/lovogub.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
    • 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_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 5204 bytes
SHA-256: 8eafaca13ae4698031779191afe0d145d8fd2b1daa0edc65822739d5b3dc27ee
font_01_sfnt_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 11948 bytes
SHA-256: 42b46a37d068a4fc900fb083bd83fe0fe58756573a527f234977d65dd018a6cd
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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