Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f72be8532f89f1…

MALICIOUS

PDF

84.6 KB Created: 2021-03-24 00:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dce7eee3d81e8adbd0f83014ec078890 SHA-1: aedac6cf90ce9839d75a9ea6c50d0d58bcd2ea2d SHA-256: 18f72be8532f89f1478442b46a89eb648e1f5a1422835d84a279c1c19e0f113d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=binomial+distribution+function+pdf PDF link annotation
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/c77daa420a.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/types_of_validity_in_assessment.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/ji2ijjS/10087731965.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/3980367.pdfIn PDF document text
    • https://nusutena.weebly.com/uploads/1/3/0/7/130739474/jojogivuvumelegib.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/2449668.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/maths_tables_11_to_30.pdfIn PDF document text
    • http://jalakerag.22web.org/61963548270.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/attestation_de_prise_en_charge_tudiant.pdfIn PDF document text
    • https://nuxogisufebodad.weebly.com/uploads/1/3/5/9/135965827/c15b4d9.pdfIn PDF document text
    • https://dalibigexewekef.weebly.com/uploads/1/3/2/7/132712129/pupoxuwirifizetul.pdfIn PDF document text
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/9046512.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/onjfhah/9986380081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabudevegal.epizy.com/wubedixogewemawogavaxoxid.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/kenmore_glass_top_stove_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf573b2-1344-43d6-8a62-a9f448fd49a9/17892137312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5464cf2d-07eb-4d7c-93e4-1234de98c1fb/nakopesuv.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_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 5492 bytes
SHA-256: e6233e80ddef57c797466a0eb20c30d78a91c245d2b9f92cb348b5fe4aaa7773
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 11444 bytes
SHA-256: cfc379110138ab68d7e6f944eb2bd9e177a6bceb5c7b818ab70bb2f12a81c52d
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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