Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfc8fe80da34dfe…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 09:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5521dc57be317cc4f28a3e36687ef9a7 SHA-1: 52ae1ca7d0d529165cbedc24522f815f608c1ebd SHA-256: ccfc8fe80da34dfe096edebdcd28e7190f94d0bc7e4e735f072b64f71f4e5281
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 0.9997

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://xezojetit.ru/123?utm_term=guideline+definition+origin PDF link annotation
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/2f305fc7fe679a.pdfIn PDF document text
    • https://vakonawokedoze.weebly.com/uploads/1/3/4/5/134522954/juzuronimobek_bukubalozode_vurugokow_lodoraluxemup.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/399fc8ef.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/13888813881.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/9770809.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/096b99ef-cde7-407b-a7e6-a47bf2425c6f/jesutuzuzaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e868b32-8a81-4793-97b6-93b3e1c3f779/music_business_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347db76f-1f59-4814-84b0-d8c8b4b619a7/50574096478.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_e5e91762de6e4633804263a297772a21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3810040d-2212-430d-9c33-e6cfc55e3577/kokirerepewefikijozixizod.pdfIn PDF document text
    • http://mepitar.atwebpages.com/55809388744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed52e92-3a9e-4de8-928b-a2fee9f0b238/zakojibapuvewa.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_e504a31a9403443f82c628d9522b968a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99580265-a85a-48f9-a770-f98f06f6bb79/35396312658.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 4716 bytes
SHA-256: e4d9495b6427e2cd0e9b2147c45c99702abc8372f839f067c73d684342fdafdc
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 10600 bytes
SHA-256: ae1ed2540937e18cbc3aca25f0cf708d7d1ae7579cfe62d8fa79ab8126c50fa7

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